Pace of aging: How fast is your body actually getting older?

Two people sit in the same doctor’s office. Both are 45 years old. But one has the cardiovascular system of a 38-year-old, while the other’s arteries look closer to 55. Same birthday, wildly different biology. You’ve probably heard of biological age — the concept that your body’s “real” age can differ from the number on your driver’s license. But here’s what most people miss: how fast that gap is widening matters even more than the gap itself.

That’s the pace of aging — and it may be one of the most useful trend metrics you’ve never tracked.

Think of it this way: biological age is a snapshot. The pace of aging is a speedometer. A 40-year-old with a biological age of 35 sounds great — but if their pace of aging is 1.3 years per calendar year, they’re actively accelerating toward disease. Meanwhile, someone aging at 0.8 years per calendar year is literally buying themselves extra healthy years with every passing month. If you’re new to the concept, start with our explainer on biological age vs chronological age before diving into pace.

A landmark study from Columbia University and Duke University showed this isn’t just theoretical. Using data from the Dunedin Study — tracking 1,037 people from birth — researchers showed that by age 45, some participants had accumulated the wear-and-tear of a 30-year-old, while others resembled 60-year-olds. The difference was not genetics or luck alone. Their pace of aging varied dramatically.

What you’ll learn:

• What pace of aging actually measures (and why it’s different from biological age)
• How DunedinPACE — the best-studied pace-of-aging test — works
• The two ages where aging dramatically accelerates (Stanford data)
• 7 evidence-based strategies to slow your personal aging rate
• How to track your pace of aging with wearable technology

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What is pace of aging?

Pace of aging measures how many biological years your body accumulates per calendar year. A pace of 1.0 means you’re aging at the expected rate. Below 1.0 means you’re aging slower than average. Above 1.0 means your body is deteriorating faster than your chronological age would suggest.

Quick definition: Pace of aging is the rate at which your body accumulates biological damage per unit of time — essentially, your aging speedometer.

This distinction matters more than you might think. Biological age tells you where you are right now. Pace of aging tells you where you’re headed. Two people with the same biological age of 40 could have completely different health trajectories if one is aging at 0.85 years per year and the other at 1.2.

Pace of aging vs. biological age: why both matter

Metric	What it tells you	Analogy
Biological age	Current state of your body	Your location on a map
Pace of aging	How fast you’re accumulating damage	Your speed and direction

If biological age is a photograph, pace of aging is a video. And just like a car’s speedometer matters more than its current position when you’re trying to avoid a cliff, your pace of aging is the metric that best predicts your future health outcomes.

Longitudinal studies using DunedinPACE and related pace-of-aging measures support this distinction: faster aging pace is associated with higher disease burden, cognitive and physical decline, and mortality risk. It complements static biological age measurements rather than replacing them, because one tells you current state while the other tracks direction.

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The science behind pace of aging

The concept emerged from one of the longest-running longitudinal studies in human history: the Dunedin Multidisciplinary Health and Development Study. Starting in 1972, researchers tracked 1,037 people born in Dunedin, New Zealand, measuring their health repeatedly across decades.

How pace of aging was discovered

The breakthrough came when researchers at Duke University and Columbia University realized they could quantify aging speed by tracking 19 biomarkers across multiple organ systems — cardiovascular, metabolic, renal, hepatic, immune, dental, and pulmonary — measured at ages 26, 32, 38, and 45.

By averaging the rate of decline across these biomarkers, they created the first empirical measure of aging speed. The results were striking: among these same-age adults, some were biologically aging at a pace of 0.4 years per calendar year (essentially aging in slow motion), while others were deteriorating at 2.4 years per calendar year — six times faster.

DunedinPACE: the best-studied pace-of-aging measurement

In 2022, the same research team published DunedinPACE (Pace of Aging Calculated from the Epigenome) in eLife. This algorithm analyzes DNA methylation patterns from a single blood draw to estimate how fast someone is aging.

What makes DunedinPACE unique:

• Trained on actual change: Unlike other epigenetic clocks (Horvath, Hannum, GrimAge) that estimate static biological age, DunedinPACE was specifically trained to capture the rate of physiological decline
• Single timepoint: Only needs one blood sample to estimate your aging speed
• Intervention-responsive: Among all aging clocks, DunedinPACE shows the highest sensitivity to lifestyle interventions — meaning when you make changes, this metric actually moves
• Validated predictions: Faster DunedinPACE scores have been associated with heart disease, cognitive decline, disability, and mortality across multiple independent samples

A DunedinPACE score around 1.0 is conventionally interpreted as roughly one biological year per calendar year. Lower scores suggest slower aging pace; higher scores suggest faster aging pace. Treat a single result as a trend input rather than an exact personal risk calculator: assay version, sample type, and retest noise matter, and the strongest signal comes from repeated measurements plus clinical context.

By 2026, DunedinPACE had been tested across many independent cohorts and disease, lifestyle, and intervention contexts, making it one of the most replicated pace-of-aging measures. But replication does not make it a medical diagnosis; it is best used as a longitudinal risk and intervention-response biomarker.

The two ages where aging accelerates dramatically

A Stanford Medicine study published in Nature Aging added another crucial piece to the puzzle. By measuring more than 11,000 molecules in the human body over time, researchers found that biological aging does not appear to move at a constant rate. Their longitudinal cohort showed substantial nonlinear shifts around two periods: the mid-40s and around age 60.

Around age 44, the largest shifts involved molecules related to cardiovascular health, lipid metabolism, and alcohol processing. Around 60, a second wave involved immune function, carbohydrate metabolism, and kidney health. These are not destiny points, but they are useful windows for closer tracking and earlier intervention.

For women, the mid-40s acceleration often coincides with perimenopause — a transition shown to accelerate biological aging by approximately 6% through epigenetic clock measurements.

This finding explains why some people seem to “age overnight” in their mid-40s or early 60s — and why tracking your pace of aging during these windows is especially critical.

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How is pace of aging measured?

There are now several validated approaches to estimate how fast you’re aging, ranging from clinical blood tests to wearable technology.

1. Epigenetic testing (DunedinPACE)

The most direct method. A blood sample is analyzed for DNA methylation patterns at specific CpG sites. The DunedinPACE algorithm processes these patterns to output a single number: your aging speed. Available through specialty labs, this kind of test usually costs more than routine blood work and is most useful when repeated on a sensible schedule rather than treated as a one-off verdict.

Best for: Baseline measurement, tracking response to major lifestyle changes (every 6-12 months)

2. Biomarker panel approach

Using the original Dunedin methodology, you can estimate pace of aging through standard blood work. The 19 biomarkers span multiple organ systems:

System	Key biomarkers
Cardiovascular	Blood pressure, mean arterial pressure, cardiorespiratory fitness
Metabolic	HbA1c, fasting glucose, HDL/LDL cholesterol, triglycerides, BMI, waist-hip ratio
Renal	Creatinine, BUN
Hepatic	Liver enzymes
Immune	White blood cell count, hs-CRP
Pulmonary	FEV1 (lung function)
Dental	Gum health indicators

By tracking these values over time, a composite aging pace can be calculated. This is less precise than epigenetic testing but more accessible and affordable. If you want to start with the most validated blood-based aging clock, our PhenoAge score interpretation guide walks through all nine biomarkers and how to read your results.

3. Wearable-based aging clocks

The newest frontier. A 2025 study published in Nature Communications introduced PpgAge — an aging clock built from Apple Watch photoplethysmography (PPG) data. By analyzing the shape of pulse waveforms, which change as vascular physiology changes with age, researchers predicted users’ ages within about 2.5-3 years on average.

The “PpgAge gap” — the difference between predicted and chronological age — can serve as a frequent proxy for aging-related vascular physiology when tracked over time. The same study captured striking real-world signals: participants who experienced a major cardiac event (heart attack, bypass surgery, valve replacement) showed an increase in predicted biological age of 1.7-2.5 years over the following six months, while pregnancy was associated with a median increase of 3.56 years in predicted age across gestation. These shifts suggest wearable aging clocks may register acute physiological stressors that traditional annual tests can miss.

Why this matters: Wearable proxies can be followed frequently rather than waiting for annual blood draws. Changes in sleep, exercise, stress, and recovery may show up in wearable data weeks before they’d appear in blood work, but these measures still need clinical context.

4. Brain MRI-based pace of aging (DunedinPACNI)

In July 2025, a Duke and Columbia team published DunedinPACNI (Pace of Aging Calculated from NeuroImaging) in Nature Aging. The algorithm extracts 315 structural features from a single MRI scan to estimate how fast the brain — and the rest of the body — is aging.

What the validation cohorts showed:

• People with the fastest DunedinPACNI scores were 60% more likely to develop dementia in subsequent follow-up
• Faster scores predicted accelerated brain atrophy, particularly in the hippocampus, and conversion from mild cognitive impairment to dementia
• The fastest agers were 40% more likely to die within the study timeframe than slower agers
• Faster pace also tracked with higher rates of heart attacks, lung disease, and stroke — confirming that brain aging mirrors body-wide aging

Best for: Adults who already have access to brain MRI through neurological care, or anyone wanting a cognitive-aging-focused complement to blood-based clocks. Unlike DunedinPACE, this measure is currently a research tool — not yet a consumer product.

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7 proven ways to slow your pace of aging

The most encouraging finding from pace-of-aging research is that it’s modifiable. Unlike your chronological age, your aging speed responds to intervention. The CALERIE trial (the first randomized controlled trial of caloric restriction in humans) showed measurable reductions in DunedinPACE within just 2 years. After the initial gains, progress often slows — if your score stops moving entirely, that pattern is known as a biological age plateau and requires a different diagnostic approach. For the broader picture of what the 2026 science says about not just slowing but reversing biological aging — from epigenetic reprogramming to lifestyle protocols — that guide covers the full frontier. For a practical action plan covering exercise, sleep, blood work, and stress management specifically starting in your 30s, see how to slow aging after 30. Other interventions work even faster.

1. Optimize your cardiovascular fitness

Why it works: VO2 max is one of the strongest modifiable predictors of long-term health. A 2024 overview of meta-analyses covering more than 20.9 million observations found that high cardiorespiratory fitness was associated with substantially lower all-cause mortality risk, and each 1-MET higher fitness level was linked to an 11-17% lower all-cause mortality risk.

How to do it:

• Aim for 150-300 minutes of moderate or 75-150 minutes of vigorous aerobic activity per week
• Include 1-2 sessions of high-intensity interval training (HIIT) for maximum VO2 max gains
• Track your progress — VO2 max improvements are measurable within 4-6 weeks

Expected results: A well-structured cardio program can improve VO2 max by 10-20% in 3-6 months, improving multiple cardiovascular and metabolic biomarkers that feed into pace-of-aging models.

2. Prioritize resistance training

Why it works: Sarcopenia (age-related muscle loss) accelerates biological aging by worsening insulin sensitivity, bone density, and metabolic health. Resistance training reverses multiple aging pathways simultaneously.

How to do it:

• Train all major muscle groups 2-3 times per week
• Focus on compound movements: squats, deadlifts, rows, presses
• Progressively increase load — muscle adaptation requires progressive overload
• Target at least 0.7-1.0 g of protein per pound (1.6-2.2 g/kg) of body weight daily

Expected results: 12 weeks of consistent resistance training can improve grip strength by 15-25% — a biomarker directly linked to pace of aging and mortality risk.

3. Master your sleep architecture

Why it works: Sleep is when your body performs critical repair processes: glymphatic clearance (brain waste removal), growth hormone release, DNA repair, and immune recalibration. Chronic sleep disruption accelerates virtually every biomarker in the aging panel.

How to do it:

• Target 7-8.5 hours of total sleep time
• Maintain a consistent sleep-wake schedule (even on weekends)
• Optimize deep sleep: cool bedroom (60-67 F / 15-19 C), total darkness, no alcohol within 3 hours of bed
• Manage your adenosine pressure naturally — avoid caffeine after 2 PM

Expected results: A Cell Metabolism study showed that biological-age signals can rise during acute physiological stress and move back during recovery. Sleep is one of the most practical recovery levers, so fixing sleep can improve several pace-of-aging inputs within weeks.

4. Reduce chronic inflammation

Why it works: Chronic low-grade inflammation (inflammaging) is a core driver of accelerated biological aging. Elevated hs-CRP and pro-inflammatory cytokines directly increase DunedinPACE scores.

How to do it:

• Adopt an anti-inflammatory dietary pattern: Mediterranean-style, rich in omega-3 fatty acids, polyphenols, fiber
• Minimize ultra-processed foods, refined sugars, and industrial seed oils
• Include anti-inflammatory compounds: fatty fish (2-3 servings/week), turmeric, green tea, berries
• Manage visceral fat — it’s the body’s largest source of inflammatory molecules

Expected results: Switching to a Mediterranean diet can reduce hs-CRP by 20-40% within 3 months, with corresponding improvements in aging biomarkers.

5. Manage stress and build resilience

Why it works: Psychological and physiological stress can accelerate biological-aging signals. A Yale-led study published in Cell Metabolism showed that biological-age measures increased during acute stress and moved back during recovery. But chronic unresolved stress may keep recovery incomplete. One proposed mechanism is specific: chronic stress is associated with DNA methylation changes at sites used by epigenetic clocks, which can raise measured biological age.

How to do it:

• Practice daily stress management: 10-20 minutes of meditation, breathwork, or contemplative practice
• Track heart rate variability (HRV) — it’s the most sensitive real-time indicator of stress recovery
• Maintain strong social connections — loneliness increases mortality risk by 26%
• Set boundaries on work stress, news consumption, and screen time

Expected results: Regular meditation practice can improve HRV by 15-20% over 8 weeks, directly indicating improved autonomic balance and slower aging.

6. Leverage metabolic health

Why it works: Insulin resistance and poor glucose control are among the strongest accelerators of aging pace. The glycation process — where excess glucose permanently damages proteins — directly increases biological age.

How to do it:

• Monitor fasting glucose and HbA1c regularly
• Practice time-restricted eating (12-16 hour overnight fast) to improve insulin sensitivity
• Walk for 10-15 minutes after meals to blunt glucose spikes
• Prioritize fiber-rich foods that slow glucose absorption

Expected results: The CALERIE trial showed that sustained caloric restriction slowed DunedinPACE over 2 years, with small but measurable effects. Researchers have described that magnitude as potentially meaningful at the population level, but it should not be read as a direct personal mortality-risk calculator. A long-term legacy follow-up of CALERIE participants is underway to test whether these short-term aging changes translate into reduced chronic disease and mortality across the following decade.

7. Stay consistently active (beyond exercise)

Why it works: NEAT (non-exercise activity thermogenesis) — the energy you burn through daily movement outside of formal exercise — accounts for a larger portion of total energy expenditure than workouts. Sedentary behavior independently accelerates aging, even in people who exercise regularly.

How to do it:

• Target 7,000-10,000 steps per day as a baseline
• Break up prolonged sitting every 30-60 minutes
• Take stairs instead of elevators — stair climbing is independently associated with lower cardiovascular mortality
• Walk or cycle for transportation when possible

Expected results: A Lancet meta-analysis found that each additional 1,000 daily steps above 4,000 reduces all-cause mortality risk by approximately 15%, with benefits plateauing around 10,000 steps.

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How to track your pace of aging

The best strategy combines periodic clinical assessment with continuous wearable monitoring.

Clinical tracking (every 6-12 months)

Test	What it reveals	Optimal frequency
Comprehensive blood panel	Multi-organ biomarkers (metabolic, renal, hepatic, immune)	Every 6-12 months
DunedinPACE epigenetic test	Best-studied methylation pace-of-aging signal	Annually (or before/after major interventions)
VO2 max assessment	Cardiovascular aging trajectory	Every 6-12 months
Body composition (DEXA)	Muscle mass trends, visceral fat	Annually

Daily wearable tracking

Modern wearables provide a continuous window into the biomarkers that drive aging pace:

• Resting heart rate trend: Rising RHR over weeks/months signals cardiovascular stress
• HRV trajectory: Declining HRV indicates accumulated stress and autonomic dysfunction
• Sleep quality metrics: Deep sleep percentage, sleep regularity, respiratory rate during sleep
• Activity consistency: Steps, active calories, exercise minutes — patterns matter more than peaks
• Training load balance: Avoiding chronic overtraining that accelerates aging

The key is tracking trends over time, not single-day values. A single bad night’s sleep doesn’t change your pace of aging. But a pattern of declining HRV, rising resting heart rate, and disrupted sleep over weeks absolutely does. Our guide on biological age trend vs single score explains the statistical logic behind why longitudinal data is so much more actionable than any single measurement.

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How SuperAge tracks your pace of aging

Understanding your pace of aging is valuable. Being able to see it change in real time is transformative. That’s exactly what SuperAge does.

Biological age trend monitoring

SuperAge calculates your biological age using data from Apple Watch and HealthKit — including VO2 max, HRV, resting heart rate, sleep, activity, body composition, and more. But it doesn’t just give you a static number. It tracks your biological age over time, building a trend line that reveals your personal pace of aging.

When your biological age is decreasing relative to your chronological age, you’re aging slower. When it’s increasing, you’re aging faster. SuperAge makes this trajectory visible and actionable.

Intelligent trend alerts

SuperAge’s Trend Alert system automatically detects when your biological age is trending in the wrong direction. It identifies which specific health domains are driving the change — whether it’s declining cardiovascular fitness, worsening sleep, increased stress, or loss of activity consistency.

Instead of just showing you a red number, SuperAge pinpoints the top declined metrics with their exact delta: “Your HRV dropped by -4.2 ms” or “Your VO2 max decreased by -1.3 ml/kg/min.” This turns an abstract concept — “you’re aging faster” — into a concrete action plan.

AI-powered insights

When a worsening trend is detected, SuperAge generates personalized AI insights that analyze your specific pattern of decline. These aren’t generic tips. They’re contextualized recommendations based on your actual health data — which metrics dropped, how fast, and what’s most likely to help based on the scientific literature.

Progress visualization

Every improvement you make is reflected in your biological age trajectory. Improve your sleep consistency for two weeks? Watch your biological age tick down. Add two strength sessions per week? See the trend reverse. SuperAge turns the abstract science of pace of aging into a daily feedback loop that keeps you motivated and on track.

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Frequently asked questions

What is a normal pace of aging?

A DunedinPACE score around 1.0 is usually framed as roughly average pace, with lower values suggesting slower aging and higher values suggesting faster aging. The exact interpretation depends on the assay, reference population, and retest pattern, so do not overread one result. The useful news: pace of aging is modifiable at many starting points.

Can you actually slow down aging?

Yes — this is no longer theoretical, but the effect size and durability depend on the intervention. The CALERIE randomized controlled trial demonstrated that caloric restriction slowed DunedinPACE in humans. Exercise, improved sleep, and stress reduction influence many of the biomarkers that feed pace-of-aging models. A Yale-led study also showed that biological-age signals can move back during recovery from acute stress, supporting the idea that at least some components are dynamic.

How is pace of aging different from biological age?

Biological age is your body’s current state — like a snapshot of wear-and-tear. Pace of aging is the speed at which that wear-and-tear is accumulating. You can have a favorable biological age (younger than your chronological age) but still be aging quickly — meaning your advantage is shrinking. Conversely, you can have an older biological age but be aging slowly, meaning you’ve stabilized and are preventing further decline.

At what age does aging speed up the most?

Stanford research analyzing 11,000+ molecules found two dramatic acceleration points: around age 44 and age 60. At 44, cardiovascular and metabolic molecules shift rapidly. At 60, immune function, carbohydrate metabolism, and renal health undergo major changes. These are critical windows where lifestyle interventions have the greatest impact on long-term aging pace.

Can a brain scan reveal how fast you’re aging?

Yes. The 2025 DunedinPACNI study, published in Nature Aging, showed that a single structural MRI brain scan can estimate pace of aging with remarkable predictive power. People scoring as the fastest agers were 60% more likely to develop dementia and 40% more likely to die during the follow-up period. The tool reads 315 features from the scan, picking up changes in cortical thickness, hippocampal volume, and white matter integrity that mirror body-wide aging.

Can Apple Watch measure pace of aging?

Not directly through Apple’s native software, but the underlying data is useful. Research published in Nature Communications (2025) showed that Apple Watch PPG (pulse) data can estimate age within about 2.5-3 years on average and capture stress-linked shifts over time. Apps like SuperAge use Apple Watch and HealthKit data to calculate biological age trends over time — providing a wearable-based pace-of-aging proxy through continuous monitoring of HRV, VO2 max, resting heart rate, sleep, and activity patterns.

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Key takeaways

• Pace of aging measures speed, not position: It estimates how fast your body is accumulating biological damage per calendar year — a useful trend metric for future health
• DunedinPACE is the best-studied pace clock: Trained on actual longitudinal change, it’s one of the most intervention-responsive epigenetic clocks available
• Aging may shift around the mid-40s and 60: Stanford data shows these are windows where molecular changes cluster — making tracking and intervention especially important
• It’s modifiable: Exercise, sleep, nutrition, stress management, and metabolic health all measurably reduce aging pace — some within weeks
• Wearables make daily tracking possible: Apple Watch data can now estimate aging trajectories, and SuperAge turns this into an actionable biological age trend
• Imaging joins the toolkit: DunedinPACNI (2025) shows a single MRI can predict dementia and mortality risk by reading the brain’s structural aging signature

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Take control of how fast you age

You can’t stop time. But you can control how much damage each passing year inflicts on your body. The science is clear: pace of aging is modifiable, measurable, and — with the right tools — manageable.

Ready to see your pace of aging? Download SuperAge and start tracking your biological age trend. Watch your aging speed respond to every workout, every good night’s sleep, and every healthy choice you make.

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References

1. Belsky, D.W. et al. (2022). “DunedinPACE, a DNA methylation biomarker of the pace of aging.” eLife, 11:e73420.
2. Belsky, D.W. et al. (2015). “Quantification of biological aging in young adults.” PNAS, 112(30):E4104-10.
3. Shen, X. et al. (2024). “Nonlinear dynamics of multi-omics profiles during human aging.” Nature Aging.
4. Miller, A.C. et al. (2025). “A wearable-based aging clock associates with disease and behavior.” Nature Communications, 16:9264.
5. Poganik, J.R. et al. (2023). “Biological age is increased by stress and restored upon recovery.” Cell Metabolism, 35(5):807-820.
6. Waziry, R. et al. (2023). “Effect of long-term caloric restriction on DNA methylation measures of biological aging: CALERIE trial analysis.” Nature Aging, 3:248-257.
7. Lang, J.J. et al. (2024). “Cardiorespiratory fitness is a strong and consistent predictor of morbidity and mortality among adults.” British Journal of Sports Medicine, 58(10):556-566.
8. Ying, K. et al. (2024). “Epigenetic Clocks: Beyond Biological Age.” Aging Cell.
9. Whitman, E.T. et al. (2025). “DunedinPACNI estimates the longitudinal Pace of Aging from a single brain image to track health and disease.” Nature Aging, 5:1619-1636.

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Last updated: 2026-06-29. This article is regularly reviewed to ensure accuracy.