Every single time the possibility of curing aging comes up, we get those misanthropes who demand loudly that It's Very Important That You Must Die, for The Greater Good, or something. And every time I say the same thing: say the situation were reversed: everyone is living forever, and it starts (arguably) causing those problems you have in mind. Your solution to those problems is to kill everyone over a certain age!?
https://nickbostrom.com/fable/dragon