DNA Methylation Age (e.g., Horvath, GrimAge, DunedinPACE)

Specialist

also epigenetic age, biological age clock

What it isAlgorithms that estimate biological age from methylation patterns at specific CpG sites on DNA. Different clocks capture different things: first-generation clocks (Horvath) estimate chronological age; second-generation clocks (PhenoAge, GrimAge) better predict mortality; pace-of-aging clocks (DunedinPACE) estimate the current rate of aging.

DoesProvides a single integrated readout of cumulative biological aging at the molecular level.

GoodA biological age below chronological — or a low pace of aging — suggests favorable cumulative biology and predicts longer healthspan.

BadA biological age above chronological — or a high pace of aging — predicts higher mortality, dementia, cardiovascular disease, and overall morbidity. Smoking, obesity, chronic stress, and poor sleep all accelerate the clock.

Standard

Chronological age as baseline; clock-specific reference distributions.

Optimal

Biological age 5–10 years below chronological, DunedinPACE <1.0 (lower is good)

Modifiers

Tissue sampled matters (most clocks use blood); some clocks are sensitive to acute illness, recent intense exercise, and pregnancy.

How to optimize

Lifestyle: Zone 2 and strength training, prioritize sleep, stress reduction, avoid smoking and excess alcohol, social connection — the levers with the largest measured epigenetic impact.
Diet: Mediterranean pattern, adequate protein, plant variety, time-restricted eating in selected people; methyl-donor nutrients (folate, B12, choline, betaine).
Supplements: Omega-3 EPA+DHA 2–4 g/day, vitamin D3 if deficient, methylated B-vitamins, glycine, NAC; some evidence for collagen, taurine, and spermidine.
Peptides: Epitalon, Thymalin, MOTS-c, NAD+, SS-31 — all studied for epigenetic and mitochondrial aging effects.
Drugs: Metformin, rapamycin (off-label, experimental), GLP-1 receptor agonists in those with metabolic indications all under investigation for epigenetic impact.

within Longevity & Healthspan