What is DunedinPACE and how does it differ from other biological age tests?

DunedinPACE (Pace of Aging Computed from the Epigenome) is a third-generation epigenetic clock that measures your current rate of aging rather than cumulative damage. Unlike static clocks like Horvath (which predict chronological age) or GrimAge (which predicts mortality), DunedinPACE acts as an aging 'speedometer' — showing how fast you are aging right now. This makes it the preferred biomarker for tracking the effectiveness of longevity interventions.

How accurate is the DunedinPACE clock for measuring aging?

DunedinPACE has been validated in over 65 cohorts and is considered the most sensitive epigenetic clock for detecting lifestyle changes. It measures longitudinal changes across 19 biomarkers of cardiovascular, metabolic, renal, hepatic, pulmonary, periodontal, and immune systems. Test-retest reliability is high enough to detect meaningful biological changes from interventions like caloric restriction or exercise programs.

Should I choose DunedinPACE or GrimAge for longevity tracking?

Use DunedinPACE for tracking your aging trajectory and monitoring intervention effectiveness (the 'speedometer'). Use GrimAge for overall mortality risk stratification and disease prediction (the 'odometer'). For comprehensive longevity tracking, run both. DunedinPACE is better for biohackers actively testing protocols; GrimAge is better for baseline health risk assessment.

DunedinPACE Explained: The Gold Standard for Biological Age Testing

How Does DunedinPACE Measure Your Biological Aging Rate?

Your DNA sequence is fixed at birth. Your epigenome changes daily. Learn how methylation clocks like DunedinPACE measure the pace of aging—and how interventions can slow it.

CHRONOLOGICAL AGE

45 yrs

Fixed by calendar

≠

BIOLOGICAL AGE

38 yrs

Modifiable by lifestyle

7 years younger on DunedinPACE = slower aging rate

Short Answer What Is DunedinPACE and How Does It Measure Aging?

DunedinPACE is a 3rd-generation epigenetic clock that measures your rate of biological aging — not your total biological age. It analyzes methylation at 173 specific CpG sites from Illumina 850K EPIC arrays. A score of 1.0 means you age one year per calendar year; below 0.9 indicates slower aging. Unlike static clocks (Horvath, GrimAge), DunedinPACE responds to interventions within 4–8 weeks. Testing available from TruDiagnostic ($349) and Elysia UK (£250). Validated in 65+ cohorts (Belsky et al., Nature Aging, 2022).

What Is DNA Methylation and Why Does It Matter for Aging?

DNA methylation is the addition of a methyl group (-CH₃) to cytosine bases in your DNA, typically at CpG sites (where cytosine is followed by guanine). This chemical modification doesn't change your DNA sequence but controls whether genes are "on" or "off."

The Key Insight

Methylation patterns change predictably with age. By measuring methylation at specific CpG sites, we can calculate biological age—how much wear and tear your cells have accumulated—independent of your birthdate.

What is a CpG Site?

DNA Sequence:

5'—A—T—G—C—G—A—T—C—C—G—T—A—3'

CpG sites = Cytosine-Guanine dinucleotides (marked above)

Methylation Status:

Methylated (mCG) → Gene OFF Unmethylated (CG) → Gene ON

How Do the Major Epigenetic Clocks Compare?

Clock	Year	CpG Sites	Measures	Best For
Horvath Clock	2013	353	Biological age	Baseline aging
Hannum Clock	2013	71	Biological age (blood)	Blood-specific aging
PhenoAge	2018	513	Phenotypic age (health)	Disease risk prediction
GrimAge	2019	1030	Time-to-death	Mortality prediction
DunedinPACE	2022	173	Pace of aging	Intervention tracking

How Does DunedinPACE Measure Your Aging Speed?

DunedinPACE (Dunedin Pace of Aging Calculated from the Epigenome) is a 3rd Generation Epigenetic Clock developed using longitudinal data from the Dunedin Study. Unlike previous generations, it focuses on just 173 specific CpG sites that correlate with physiological decline, making it surgically precise for intervention testing.

How Can You Get Your Epigenetic Age Tested?

Choose a Testing Provider

Providers offering DunedinPACE-compatible methylation arrays (Illumina 850k EPIC):

TruDiagnostic ($349) — Best US option, includes all major clocks
Elysia (UK) (£250) — European option, GrimAge + DunedinPACE
GlycanAge — Alternative: glycan-based aging (not methylation)

Submit Blood Sample

Methylation testing requires a blood draw (not saliva). Kit includes a dried blood spot card or phlebotomy order for liquid blood. Follow fasting instructions if provided.

Receive Methylation Data

Results include:

Multiple clock outputs (Horvath, Hannum, PhenoAge, GrimAge, DunedinPACE)
Age acceleration/deceleration for each clock
Raw IDAT files (if requested) for independent analysis

Track Over Time

Retest every 6-12 months to measure intervention effects. DunedinPACE is the most sensitive for short-term tracking. GrimAge is best for long-term mortality reduction.

Which Interventions Actually Slow Epigenetic Aging?

Intervention	Evidence Level	Clock Response	Timeframe
Caloric Restriction (CR)	STRONG	-0.1 to -0.2 DunedinPACE	8-12 weeks
Exercise (150min/wk)	STRONG	-0.05 to -0.1 DunedinPACE	12-16 weeks
Smoking Cessation	STRONG	-2 to -5 years GrimAge	6-24 months
Metformin	MODERATE	-0.05 DunedinPACE	6-12 months
Rapamycin (mTOR inhibition)	EMERGING	Under investigation	TBD
Alpha-ketoglutarate (AKG)	WEAK	Preliminary only	TBD

⚠️ Note: WGS vs Methylation

Standard Whole Genome Sequencing (WGS) does NOT capture methylation data. You need a dedicated methylation array (Illumina 450k or 850k EPIC) or bisulfite sequencing. These are separate tests from ancestry/health DNA kits.

Can I Use VCF Data for Epigenetic Analysis?

Short answer: No. VCF files contain your genetic variants (SNPs, indels), not methylation status. They're fundamentally different data types:

VCF (Variant Call Format)

Contains: Genetic variants (mutations)
Source: WGS, exome, microarray
Static: Doesn't change over time
Use: Disease risk, pharmacogenomics

IDAT/Beta Values (Methylation)

Contains: Methylation % at CpG sites
Source: Methylation array, bisulfite-seq
Dynamic: Changes with age/lifestyle
Use: Biological age, epigenetic clocks