Protocol
DNA methylation age · DNAmAge · epigenetic clock · biological age testing · LinAge 2.0 · Horvath clock · OMICmAge · DunedinPACE · TruAge
Methylation clocks are well established as population-level correlates: they predict all-cause mortality and age-related disease risk better than chronological age in large prospective cohorts. That is association, not utility. The interventional evidence is thin and does not support the way the test is sold. The most-cited human trial is a pilot RCT in Aging (2021, n=43 healthy men aged 50-72, 8-week diet and lifestyle programme) reporting a 3.23-year reduction in DNAmAge versus controls; the authors themselves call for larger and longer trials, the cohort was narrow, and several investigators disclosed financial interests in the intervention. Critically, the outcome measured was the clock readout itself, not a healthspan or mortality outcome. As of this research there is no RCT showing that measuring a methylation clock, or acting on the number it produces, improves any hard health outcome. Practical limits compound this: clocks are not standardised between labs, test-retest variability can be on the order of years, results are not diagnostic, and there is no validated clinical protocol for what to change if the number comes back high. Reasonable use is as a research-grade engagement or tracking metric, explicitly labelled as such. It should not be presented as a clinically actionable measure of ageing.
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What it is
A laboratory test that measures DNA methylation at a defined set of CpG sites, usually from blood or saliva, and runs the pattern through a trained statistical model to output an estimated "biological age" or rate of ageing. Different clocks (Horvath, PhenoAge, DunedinPACE, OMICmAge, and proprietary clinical versions such as LinAge 2.0) are trained on different reference data and are not interchangeable. Clinics sell it as a way to quantify how fast a person is ageing relative to their chronological age and to track whether lifestyle or medical interventions are working.
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Every entity profile on variis is sourced. Not medical advice.