Epigenetic age testing works well for measuring general biological aging. Skin-specific epigenetic clocks exist but are less mature than the general ones. Both categories have real value for tracking skin biology over time.
General epigenetic clocks:
- Horvath's multi-tissue clock (2013) — the foundational reference. Uses 353 CpG methylation sites. Validated across many tissues including skin (Horvath, 2013).
- PhenoAge (Levine, 2018) — optimized to predict morbidity and mortality, not just chronological age. More responsive to lifestyle interventions.
- DunedinPACE (Belsky, 2022) — measures the pace of aging (how quickly you're aging right now) rather than a cumulative "biological age." More useful for tracking intervention effects (Belsky, 2022).
Skin-specific epigenetic tests:
- Skin-and-blood clock (Horvath, 2018) — trained specifically on skin fibroblasts and blood. Better skin-relevance than the general clock for skin research applications.
- Consumer skin-specific tests are still emerging. As of 2026, none has established itself as the definitive skin biological-age test.
Practical utility:
- Once at baseline for a marker of overall aging trajectory
- Retest every 12-24 months to see if interventions are moving the number
- Cost: $250-500 per test
Complementary, not substitutive, to biomarker panels: An epigenetic clock tells you how quickly you're aging on average. The JenSkin panel tells you which specific mechanisms are driving your skin's aging pattern. Different lenses, complementary information.
For most people focused on skin specifically, a JenSkin panel gives more actionable per-dollar signal than epigenetic testing. For the person who's already deep into longevity tracking, they're complementary.