Claire, you're the clinical lead on a massive UK twin study that is trying to understand why people age at different rates. And I think you're saying that actually our genes turn out not to be as big a part of that as maybe you had thought? That's right. So genes contribute quite strongly to that peak that each one of us can achieve say in our 40s, 50s, whatever. But it doesn't really contribute that much to how we change after that. Good news because you're genes you can't change.

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