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Biological age — PhenoAge
Your chronological age is fixed. Your biological age isn't. We estimate it from a validated panel of blood biomarkers (the PhenoAge method) so you can see whether your body is running ahead of, or behind, the calendar.
The science
How we measure
how you age.
Everything we show you traces back to published, peer-reviewed research — biological age, pace of aging, the hallmarks that drive it, and the ranges associated with the longest healthy life. No mysticism, no proprietary black box.
The evidence base
Six foundations, all published.
Each pillar below is something you can look up. We’d rather show our working than ask you to take our word for it.
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Pace of aging — DunedinPACE
Drawn from the Dunedin Study — a cohort followed since birth — DunedinPACE measures how many biological years you age per calendar year. Above 1.0 means faster than average; below means slower.
03
The 12 hallmarks of aging
López-Otín et al. (2023) define twelve mechanisms that drive ageing — from genomic instability and inflammation to mitochondrial dysfunction. We map your markers onto these hallmarks so insights target causes, not just symptoms.
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Longevity-optimised ranges
A clinical ‘normal’ range is built to flag disease. A longevity range is built around the healthiest outcomes. We score every marker against the second — which is why a result can be ‘in range’ and still worth improving.
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Graded evidence — A / B / C
Every protocol and insight carries an evidence grade: A for strong randomised or meta-analytic support, B for promising but emerging, C for early signal. You always know how solid the ground beneath a recommendation is.
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Accredited, private by design
Samples are analysed in UKAS-accredited UK laboratories. Your data is processed under UK GDPR and held to ICO standards — your biology is yours, and never sold.
Common questions
Tap a question — it opens.
Is biological age a real measurement or a marketing number?
It's an estimate built from validated, peer-reviewed methods — PhenoAge for biological age, DunedinPACE for pace of aging — applied to your own blood. It's a model, not a crystal ball, but it's grounded in published longitudinal science rather than a lifestyle quiz.
Why score against ‘longevity’ ranges instead of standard lab ranges?
Standard reference ranges are designed to detect disease, so ‘normal’ often just means ‘not yet ill.’ Longevity-optimised ranges are anchored to the levels associated with the best long-term outcomes — which is where most of the room for improvement actually lives.
How current is the science you rely on?
We build on the most established longevity research — including the 2023 update to the hallmarks of aging (López-Otín et al.) and the Dunedin Study's ageing-pace work — and grade every recommendation A/B/C so you can see how strong the evidence is.
Where are samples analysed?
In UKAS-accredited UK laboratories, the same standard used across NHS and private diagnostics. Results are returned to you, processed under UK GDPR, and never sold.
Put it to the test
Measure your biology against the evidence.
Start with a two-minute assessment — we’ll point you to the right panel and have your first read within a week.