Epigenetic Testing: Measuring Your Biological Age
ON THIS PAGE
Chronological Age vs Biological Age
Chronological age counts years. Biological age reflects something more meaningful: how old the body’s cells behave, based on gene activity, inflammation levels, metabolic function, and the capacity for cellular repair. The two numbers are not always close, and the gap between them is not random. Understanding why requires some grounding in how epigenetics works, specifically how the chemical markers regulating gene activity respond to environment and lifestyle.
Biological age is heavily shaped by epigenetic signaling. The systems the epigenome governs, including oxidative stress management, detoxification efficiency, mitochondrial function, hormone regulation, and DNA repair, all contribute to how quickly or slowly the body ages at a cellular level. Someone can be 50 chronologically and function considerably younger biologically, or considerably older, depending largely on the cumulative signals their epigenome has received over time.
What Epigenetic Clocks Measure
Epigenetic clocks estimate biological age by analyzing patterns of DNA methylation across the genome. Methylation patterns change in predictable ways as the body ages, and researchers have identified specific genomic sites where those changes correlate strongly with biological outcomes.
The first generation of clocks, including Horvath’s clock and the Hannum clock, were designed to estimate biological age as a number. They answer the question: how old does this person’s epigenome look? Later generations moved toward measuring something more actionable.
DunedinPACE: Measuring the Speed of Aging
DunedinPACE was developed from the Dunedin Multidisciplinary Health and Development Study, a long-running research project that tracked the same group of individuals from birth through adulthood across multiple biological systems. Rather than estimating a static biological age, DunedinPACE measures the pace at which someone is aging right now.
The score it produces has a simple interpretation:
- A score of 1.0 means aging one biological year for every chronological year
- A score below 1.0 means aging more slowly than chronological time
- A score above 1.0 means aging faster than chronological time
DunedinPACE tracks changes across multiple biological systems simultaneously: inflammation markers, immune function, cardiovascular integrity, metabolic efficiency, mitochondrial output, cellular repair capacity, and stress response. Because it reflects real-time biological processes rather than accumulated historical patterns, it is more sensitive to recent lifestyle changes than earlier clock generations.
Key Concept
Most biological age tests tell you how old your epigenome looks. DunedinPACE tells you how fast it is aging right now, which is a more useful number for understanding whether current habits are helping or accelerating the process.
What Affects the Pace of Aging
DunedinPACE responds to lifestyle changes, which is what makes it practically useful rather than just informative. Research using the tool has shown that improvements in diet quality, sleep consistency, physical activity, stress patterns, and chemical exposure reduction can shift the pace of aging measurably. The direction of change over time matters more than any single data point.
The factors most consistently associated with accelerated biological aging include:
- Chronic inflammation driven by poor diet quality, seed oils, and food additives
- Sleep disruption and circadian misalignment
- Chronic psychological stress and elevated cortisol
- Persistent chemical exposure from PFAS, heavy metals, pesticides, and phthalates
- Physical inactivity
- Smoking and excessive alcohol
Factors associated with slower biological aging include consistent physical movement, high diet quality, adequate and well-timed sleep, low chemical burden, and strong social connection. These align closely with what longevity research finds in populations with unusually long healthspans.
How Epigenetic Testing Works Practically
Most consumer epigenetic testing uses a blood or saliva sample analyzed for methylation patterns at specific genomic sites. The sample is sent to a laboratory, processed, and returned as a score or biological age estimate.
Several testing options are available at different price points and with different underlying methodologies:
- TruMe and Elysium Index use first-generation clock methodology to estimate biological age
- Glycanage measures glycan patterns on antibodies as a proxy for biological age and inflammation
- TruDiagnostic offers DunedinPACE alongside several other clock methodologies and is one of the more comprehensive consumer options currently available
Results are most useful when treated as a baseline to retest after a period of deliberate lifestyle change, rather than as a single fixed number. The trajectory over time is more informative than any individual score.
What Testing Does and Does Not Tell You
Epigenetic age testing is a useful signal, not a diagnosis. A high DunedinPACE score does not identify which specific factor is driving accelerated aging, and it does not predict disease. What it does is provide a measurable reflection of how current biological conditions are trending.
For anyone who suspects significant chemical exposure, functional medicine practitioners can combine epigenetic testing with more targeted panels covering mercury, lead, PFAS, mold toxins, and pesticide metabolites. Testing before making changes, and again after sustained reductions in exposure, gives a clearer picture of what is moving the needle.
The epigenetics page covers how environment and lifestyle shape gene expression more broadly, including how daily habits, stress, and chemical exposure influence which genes are active over time.
Free Assessment
What’s your toxin exposure profile?
10 questions. Personalized results shown instantly on screen.
START MY ASSESSMENT →About This Page
This page is reviewed periodically as new research emerges. Content reflects current scientific understanding of toxin-related health topics.
Last reviewed: June 2026