I'm saying do you have proof of any individual who has stopped aging, regardless of who they are. You've brought up an athlete who is middle-aged. Proof would be someone like 200 or so. Thus far there has been a lifespan, the oldest person ever was like 125 or something. I want proof of someone who appears to have been in their twenties, that lived for like centuries until something happened to them unrelated to aging that killed them. There is no such person. The only argument you would have "in the past advances in science made that impossible and we have far more insight and such now compared to then." But that argument would only be a hypothesis because it's never actually happened yet.