How to Actually Track Your Own Aging
Tracking your own aging trajectory
Chronological age — the number of years since birth — is a poor proxy for how well someone's body is actually functioning. Biological age, measured through various biomarkers, is an attempt to capture that gap.
Epigenetic Clocks
One influential approach uses patterns of DNA methylation — chemical modifications to DNA that change in predictable ways with age — to estimate biological age from a blood or tissue sample. The original, widely used version of this approach was trained on thousands of samples across dozens of tissue types and remains one of the most validated methods in the field for estimating biological age from a molecular sample[8]. These clocks have become the standard measurement tool in aging research specifically because they respond to interventions — including, as covered in Section 5, caloric restriction — making them useful outcome measures for testing whether an intervention actually affects aging biology, not just a health-adjacent marker.
The Simpler, More Accessible Markers
Epigenetic clocks are not widely, cheaply available outside research contexts. For most people, the practically accessible biomarker panel overlaps heavily with what's already covered in the Heart & Metabolic Health guide: blood pressure, ApoB (a blood marker counting artery-clogging particles), HbA1c (a measure of average blood sugar over roughly three months), waist circumference, and hs-CRP (a general marker of inflammation) — each individually associated with age-related disease risk, and collectively a reasonable, affordable proxy for biological aging trajectory without needing a specialised epigenetic test.
Why Tracking Trends Matters More Than Single Readings
As covered throughout this Archive's testing-focused sections, a single reading is less informative than a trend over time — the direction and rate of change in these biomarkers, tracked annually, is a more useful longevity signal than any single number in isolation, since it reflects whether your current habits and interventions are moving the trajectory in a favourable direction. None of this replaces paying attention to how you actually feel and function, either — energy levels, recovery time after exertion, and physical capacity are informal but worthwhile signals to track alongside the lab work, even though they aren't a substitute for it.
Section takeaway
Epigenetic clocks are the research-grade gold standard for measuring biological age, but the accessible, affordable version of biomarker tracking — the panel already covered in the Heart & Metabolic Health guide, tracked as a trend over years rather than a single reading — captures most of the same practical value for most people.