
is subjective.
Depends on your lifestyle and genetics. Those people who watched their diet, alcohol/drug intake, and stayed active all their life are going to be way better off than those people who didn't work out, ate shyt food and drink/smoke/etc. every day. There's people I went to school with who were

by 21, and there's people a decade older than me going hard in the gym, doing marathons and shyt and don't even look their age.