# Epigenetic clock

An epigenetic clock estimates biological age from DNA methylation patterns, often in blood, using a trained algorithm.

Epigenetic clocks score chemical tags on DNA that change with age and sometimes with diet, exercise, illness or drugs. They correlate with health risks in research cohorts but are not clinical diagnostic tests. Different clock models can disagree on the same person or intervention.

Also called: DNA methylation clock, biological age test.

Related: [VO2 max](https://revns.com/dictionary/vo2-max.md), [Progressive overload](https://revns.com/dictionary/progressive-overload.md)

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