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Longevity glossary

What is Biological age?

Also known as: Physiological age.
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Quick answer

Biological age: definition

Biological age is an estimate of how old your body seems based on biomarkers such as DNA methylation, blood chemistry or physical performance, rather than your date of birth.

Biological age, explained

Tools called epigenetic clocks analyze DNA methylation at specific sites; other approaches combine routine blood tests or functional measures like grip strength and VO₂ max.

Biological age can be younger or older than chronological age and may change over time with lifestyle.

Why it matters

It offers a scorecard for how you're aging and whether lifestyle changes are helping — best used for trends, not single readings.

Learn more

Longevity · GuideBiological Age: What It Is, How It's Measured and How to Improve ItWhat is biological age? Learn how epigenetic clocks and blood-based tests estimate it, how accurate they are, and the habits associated with slower biological aging.Longevity · ComparisonBiological Age vs. Chronological Age: What's the Difference?Chronological age counts years; biological age estimates how your body is aging. Learn how each is measured, why they diverge and how to influence biological age.

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FAQ

Biological age FAQs

What is Biological age?

Biological age is an estimate of how old your body seems based on biomarkers such as DNA methylation, blood chemistry or physical performance, rather than your date of birth.

Why does Biological age matter?

It offers a scorecard for how you're aging and whether lifestyle changes are helping — best used for trends, not single readings.

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