I know plenty of examples like that in my circle of family and friends.
But you know what, a lot of those people who have shitty health, eat whatever and live to be 80 are miserable, senile, weak and unhealthy people for the last ten years of their lives. They do live long lives but what sense is it to survive to 70 or 80 if you are going to be miserable and probably not be aware for the last ten years of your life?
It’s fun to say eat whatever you want and not exercise but if you risk torturing yourself for the last few years of your life … what’s the point?
I’d rather be as healthy as possible right up to end if I can help it. I certainly don’t want to be a helpless old man who can’t think anymore and leave my family to decide when and if I should go.