Blog
Biological age vs fitness age: what is the difference and which one matters more?
Biological age vs fitness age: learn how whole-body aging differs from cardio fitness age, why the numbers can disagree, and how to track both.
Biological age trend vs single score: what matters more?
A single biological age number is just a snapshot. Learn why tracking the trend over months reveals whether your longevity habits actually work.
Biological age vs metabolic age: what is the difference?
Biological age measures cellular aging from blood biomarkers. Metabolic age measures BMR versus your peers. Here is what each actually tells you.
Good biological age by age group: what is a healthy score in your 40s, 50s, and 60s?
What counts as a good biological age score depends on your decade. Age-banded benchmarks for your 40s, 50s, and 60s based on PhenoAge and KDM research.
Apple Watch vs Oura vs Whoop for longevity tracking in 2026
Apple Watch, Oura, or Whoop for longevity? A head-to-head comparison of sensor accuracy, biological age support, recovery tracking, and daily usability.
Biological age from blood tests vs wearables: Which is more accurate?
Blood tests vs wearables for biological age compared: accuracy, cost, repeatability, and when each modality is the right choice for longevity tracking.
SuperAge vs Humanity: Which app is better for biological age tracking?
SuperAge vs Humanity compared on scoring, inputs, price, and daily usefulness. Find the right biological age app for Apple Watch users in 2026.
Klotho: The anti-aging protein that could rewrite longevity science
Klotho protein declines with age and predicts mortality, cognitive decline, and disease. Learn what it does, how to increase it, and why researchers are excited.
How to test your biological age at home: 5 simple tests anyone can do
Test your biological age at home with 5 validated physical assessments. No blood work, no lab visits — just your body, a timer, and 15 minutes.