Your lifespan is far more heritable than classic studies once suggested. Reading your genes can flag risks decades before they show up in blood work, fitness levels or biological-age clocks. Here is the evidence, and what to do with it.
For years the consensus was that how long you live is mostly luck and lifestyle. Classic twin studies put the heritability of lifespan at just 20–25% — but a 2025 re-analysis found those figures were diluted by chance events like accidents and infections. Correct for them, and the genetic share more than doubles.
The genes tied to a long life are, in large part, the very same genes that cause or protect against disease. That is what makes reading them so powerful: one result flags what to guard against and reveals where your natural resilience lies — a warning and a map in one.
Why ageing itself — not any single disease — is the thing to understand, and how the biology underneath opens a window to act early.
How much of longevity is written in your genes, how they map onto the biology of ageing, and why no two people age the same way.
How to turn complexity into a clear hierarchy of decisions, and the head start that reading your genes gives that nothing else can match.
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