To amplify your point, life is indeed weird that way. Feynmann's 69 while, as you say, is not exceptionally long was at least average for men in American in the 1980s. As a far too minimal smattering: https://en.wikipedia.org/wiki/John_von_Neumann only made it to age 53. https://en.wikipedia.org/wiki/Bernhard_Riemann only to 39. https://en.wikipedia.org/wiki/%C3%89variste_Galois barely escaped his teens.