Blog
Body recomposition and biological age: can your score drop while the scale stays the same?
Learn how body recomposition can lower biological age by reducing visceral fat, building muscle, and improving biomarkers even when weight stays stable.
Shift work and biological age: how night work accelerates aging
Shift work raises biological age acceleration and CVD mortality. See how night and rotating schedules age you faster — and what actually helps.
Biological age vs vascular age: which age metric matters most?
Biological age and vascular age sound similar — but they measure different things. Here's how they compare, when each matters, and which to track.
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.
Best Apple Watch apps for biological age and longevity in 2026
The best Apple Watch apps for biological age, recovery, and longevity in 2026. Reviewed for science, daily usability, and what they actually measure.