Epigenetic Age (DNA Methylation)
Biological age calculated from DNA methylation patterns — the most scientifically validated measure of how fast you are aging.
Optimal Range
Biological age < chronological age (favorable)
Why It Matters
Epigenetic clocks like DunedinPACE, Horvath, and GrimAge measure your rate of aging at the molecular level. Unlike telomeres, these clocks respond measurably to lifestyle interventions, making them the most actionable aging biomarker available.
Understanding Epigenetic Age (DNA Methylation)
Epigenetic clocks represent the most significant advance in measuring biological aging in the past decade. They work by analyzing DNA methylation — chemical modifications (methyl groups) added to specific cytosine bases in DNA that change predictably with age. By measuring the methylation status of hundreds to thousands of specific CpG sites across the genome, algorithms can calculate a 'biological age' that may differ significantly from your chronological age.
Several validated clocks exist, each measuring slightly different aspects of aging. The Horvath clock (2013) was the first pan-tissue epigenetic clock and estimates biological age. The GrimAge clock (2019) predicts time to death and is considered one of the best mortality predictors. DunedinPACE (2022) measures the current pace of aging — expressed as years of biological aging per calendar year — and is particularly useful for tracking the impact of interventions over time (e.g., a DunedinPACE of 0.85 means you are aging at 85% of the normal rate).
What makes epigenetic clocks uniquely valuable is their responsiveness to intervention. Studies have shown that caloric restriction, exercise, improved sleep, smoking cessation, and even specific supplements can measurably reduce epigenetic age or slow the pace of aging. This makes repeat testing (typically every 6–12 months) a powerful tool for evaluating whether your longevity interventions are actually working at the molecular level. TruDiagnostic's TruAge test is currently the most comprehensive consumer epigenetic age test available.
Key Research
DNA methylation age of human tissues and cell types
Horvath S · Genome Biol (2013)
Key finding: Developed the first multi-tissue epigenetic clock, demonstrating that DNA methylation at 353 CpG sites accurately predicts biological age across all human tissues.
DunedinPACE, a DNA methylation biomarker of the pace of aging
Belsky DW et al. · eLife (2022)
Key finding: Introduced DunedinPACE as a measure of the current pace of biological aging, validated against longitudinal health data, and demonstrated it predicts morbidity and mortality independent of chronological age.