Biological age estimates how quickly your cells are accumulating the changes associated with ageing — which can run years ahead of, or behind, your date of birth.
Not all clocks measure the same thing
“Biological age” is not one test. The published clocks were trained on different outcomes, and they disagree with each other by design.
| Clock | Trained to predict | What we use it for |
|---|---|---|
| Horvath | Chronological age across tissues | Historical comparison |
| PhenoAge | Clinical markers of ageing | Disease-risk context |
| GrimAge | Time to mortality and morbidity | The most outcome-anchored figure |
| DunedinPACE | Current pace of ageing per year | Short-term response to a protocol |
We report GrimAge and DunedinPACE together: one tells you where you stand, the other tells you which direction you are currently travelling. And we keep you on the same clock across tests, because switching clocks manufactures change that is not real.
How it is performed
A blood or saliva sample, processed externally. Results take two to three weeks.
How to prepare
No fasting required. Avoid alcohol for 24 hours and sample at a typical time of day so repeat tests stay comparable.
How we read it
As a trend, not a verdict. A single reading describes a moment; a series describes a trajectory, and only the trajectory is worth acting on. It also tends to move after the metabolic and fitness markers do — not before.