Quality of life is a thing that a bunch of people miss though. If you're active in your middle ages then you're going to be able to do so much more as an 80 year old. You can also play it risky and be super shitty to your body in your 40s because you can afford to but then the next 40 years will suck. And doctors won't let you just die. They'll keep you alive as long as possible. Staying alive isn't the hard part.