bioage.ioBiological Age IndexFind a test
Comparison · 4 min read

PhenoAge vs Epigenetic Age

Understand the difference between a clinical-biomarker composite and a methylation clock.

AI-assisted editorial draft · Source check: 6 September 2026 · Independent reviewer: not yet assigned

Different inputs

Blood-based PhenoAge uses routine laboratory markers and age. Epigenetic clocks use methylation measurements at selected DNA sites. Neither category supplies a universal reference value for the other.

Source 1: Aging / Levine et al.Source 2: Genome Biology / Horvath

Different model targets

The word epigenetic covers models trained for different purposes. Ask whether the exact clock predicts chronological age, targets an outcome-associated score or estimates the pace of aging.

Source 1: Aging / Lu et al.Source 2: eLife / Belsky et al.

Avoid a false winner

A transparent calculation, a convenient sample and a strong validation study are separate advantages. Decide which matters for the question you are trying to answer, then check cost and practical access. Do not judge a method by whether it gives the youngest result.

Understand the methods

Phenotypic Age / PhenoAgeEpigenetic clocks
Educational information, not medical advice. This guide is an AI-assisted editorial draft awaiting independent review.
Check the original

Sources & verification

  1. An epigenetic biomarker of aging for lifespan and healthspan (2018)

    Aging / Levine et al. · Accessed 2026-09-06

  2. DNA methylation age of human tissues and cell types (2013)

    Genome Biology / Horvath · Accessed 2026-09-06

  3. DNA methylation GrimAge strongly predicts lifespan and healthspan (2019)

    Aging / Lu et al. · Accessed 2026-09-06

  4. DunedinPACE, a DNA methylation biomarker of the pace of aging (2022)

    eLife / Belsky et al. · Accessed 2026-09-06