How Fast Are You Aging? Understanding Pace of Aging
Rate is a different question from accumulated damage, and it is the one an intervention can actually move. What pace measures, how it was derived and what a value near one means.
The Short Answer
Most biological age measures answer a cumulative question: how much wear has accrued. Pace of ageing answers a rate question: how fast is it accruing right now. These are not the same, and the distinction is practical. Accumulated damage is largely a record of decades already lived. Rate is the part that current behaviour can plausibly influence, and it is the part that responds within a timeframe short enough to observe.
The Distinction That Matters
Consider two people at 45. Both carry the same accumulated burden, so a cumulative measure returns the same answer for each. One is ageing at 0.85 years of biology per calendar year, the other at 1.2. Over the following decade they diverge by three and a half years of biological difference, invisible to a single cumulative reading.
The analogy is a car's odometer against its speedometer. Mileage is history and cannot be reduced. Speed is current state and can be changed. Both matter, and they answer different questions.
For anyone deciding whether a change of behaviour is doing anything, rate is the more informative of the two, because it can move on a timescale a person will still care about.
Where the Measure Came From
The Dunedin Multidisciplinary Health and Development Study has followed roughly 1,000 people born in one New Zealand town in 1972 and 1973, with assessments repeated across the lifespan and unusually high retention.
Rather than modelling age, the Dunedin investigators tracked how a panel of organ-system biomarkers changed within the same individuals across two decades, then expressed each person's trajectory as a rate relative to the cohort. That produced Pace of Aging, and later a methylation-based version, DunedinPACE, that estimates the same quantity from a single blood sample.
The scale is anchored at 1.0, meaning one year of biological change per calendar year. Values below 1 indicate slower than average, values above 1 faster. The observed spread in the cohort is roughly 0.6 to 1.5, which is a wide range for people of identical chronological age.
Higher pace has been associated with worse cognitive and physical function, with facial ageing judged by observers, and with mortality. It has also been reported to respond to caloric restriction in a randomised trial, which is unusual: most clock associations are observational.
What Moves Rate
The evidence base is a mixture of observational association and a small number of controlled results. What follows is described at that level of confidence rather than as established causation.
Consistently associated with slower pace
Cardiorespiratory fitness has the strongest and most consistent association of any modifiable factor. Sleep regularity, distinct from sleep duration, appears repeatedly. Not smoking is a large effect. Diet quality, measured by whole-diet indices rather than single nutrients, is associated. Social connection appears in several analyses at effect sizes that surprise people who expect it to be soft.
Associated with faster pace
Visceral adiposity, chronic psychological stress, sustained elevated inflammatory markers, poor glycaemic control, heavy alcohol intake, and childhood adversity, which shows an association persisting into midlife.
Weakly supported or unknown
Most supplements have no pace-of-ageing evidence at all. Where an association exists it is usually indirect, through an intermediate such as glycaemic control or inflammation, rather than through a demonstrated effect on rate. Anyone selling a supplement on the strength of a pace measurement is well ahead of the data.
Measuring It Without a Methylation Test
A single-timepoint methylation assay is the most direct route, but rate can be approximated from repeated ordinary measurements, which is often more informative because the trend is the point.
| Domain | Trackable signal | Useful interval |
|---|---|---|
| Cardiorespiratory | VO2 max or a submaximal proxy, resting heart rate | Quarterly |
| Metabolic | Fasting glucose, HbA1c, triglyceride to HDL ratio | Every 6 months |
| Inflammatory | High-sensitivity CRP | Every 6 months |
| Autonomic | Heart rate variability trend, not single nights | Continuous, read monthly |
| Functional | Grip strength, gait speed, sit-to-stand | Every 6 to 12 months |
| Sleep | Timing regularity, not only duration | Continuous, read monthly |
The trajectory of these over years is a legitimate rate signal. It is less elegant than a single number and considerably harder to sell, which is roughly why the single number is what gets marketed.
Interpreting a Pace Value
Near 1.0. Average. This is where most people are, and it is not a failure. The population average includes a great deal of ordinary ageing.
Below 0.9. Slower than the cohort average. Worth noting rather than celebrating, since measurement precision is imperfect and the value will vary between readings.
Above 1.1. Faster than average. The useful response is to look at the modifiable domains above, particularly cardiorespiratory fitness, glycaemic control and sleep regularity, rather than to seek a compound that promises to lower the number.
Two caveats bound all of this. Measurement variability means a change of 0.05 between two readings is within noise, and DunedinPACE was derived in a single birth cohort in one country, so its calibration in other populations is an open question.
The honest framing is that pace of ageing is the most decision-relevant of the current biological age measures and is still a research instrument rather than a personal dashboard.
Why Rate Suits Continuity
A cumulative measure invites a single test and a single verdict. A rate measure invites repeated observation, which is the posture that actually corresponds to how biology behaves.
It also sets a realistic expectation. A person who lowers their pace from 1.15 to 1.0 has not reversed anything. They have changed the slope going forward, and over a decade that is a meaningful difference, but nothing already accumulated has been undone. Content and products that conflate the two are describing something biology does not currently support.
The corollary is patience. Rate is measured over years. Any protocol claiming to show its effect on ageing rate over eight weeks is measuring something else.
The AEONNN Perspective
Pace is the biological age framing closest to how AEONNN thinks. The platform's premise is that biology is never still, so a rate is a more natural object than a snapshot, and continuity is the product rather than a one-off assessment.
It maps primarily to Pillar 10 and draws heavily on Pillar 4, Metabolic and Cardiovascular Health, because glycaemic control and fitness dominate the modifiable associations. The Real-Time User layer contributes the signals that actually update between lab draws, sleep regularity and heart rate variability trend among them, and the Population layer supplies the cohort calibration that a single reading needs to mean anything.
What AEONNN will not do is present a supplement as a lever on pace of ageing. That claim is not supported for any consumer compound, and the Evidence layer marks it accordingly.
Pillar Matrix mapping
Longevity and Biological Age, Metabolic and Cardiovascular Health
Database Matrix layers
- Evidence Layer (PubMed, Cochrane, ClinicalTrials.gov)
- Population Layer (UK Biobank, NHANES)
- Meta / Consensus Layer (JAMA, BMJ, specialty society positions)
- Real-Time User Layer (wearable and adherence signals)
Frequently Asked
What is pace of aging?
A rate measure: how much biological change accrues per calendar year, anchored so that 1.0 equals one year of biology per year. It is distinct from cumulative measures of accrued damage.
What is DunedinPACE?
A methylation-based estimate of pace of ageing derived from the Dunedin birth cohort, which followed roughly 1,000 people from 1972 across two decades of repeated organ-system measurements.
Is a pace of 1.0 bad?
No. It is average, and average includes ordinary ageing. Values below 0.9 are slower than the cohort, above 1.1 faster.
What lowers pace of aging?
Cardiorespiratory fitness shows the strongest and most consistent association, followed by sleep regularity, not smoking, diet quality and social connection. Most of this evidence is observational.
Can supplements change pace of aging?
There is no consumer supplement with evidence of a direct effect on pace of ageing. Any association runs indirectly through intermediates such as glycaemic control or inflammation.
How often should pace be measured?
Rate is a multi-year signal, and measurement variability means small differences between readings are noise. Annual measurement is the shortest interval that is likely to be informative.
Can I estimate pace without a methylation test?
Approximately, by tracking cardiorespiratory fitness, glycaemic markers, inflammatory markers, heart rate variability trend and functional measures over years. The trajectory is the signal.
Evidence and review
Any dosage ranges cited here reflect the ranges used in published human trials, not personal recommendations. Evidence in this field moves, so this article is reviewed quarterly and carries its last-updated date above. Nothing here is intended as medical advice, and supplementation should be discussed with a qualified clinician, particularly alongside prescribed medication or an existing condition.