Isn’t that the human condition though?

Yes, except imagine your ticking time bomb set to go off 40 years before everyone else’s.

Also, it doesn't kill you but will make you an burden to all of your loved ones.

Eh, if i start having symptoms I'm out. I'm not wasting away for decades being a burden to family and society. Rather just get it over with.

I used to think this way too. Now I recognize I was naive. It's a gradual decline, and once you get to the point that you are no longer providing any value, it's probably too late to take yourself out.

That requires decision-making and rationality of the sort that OP shows may be some of the first things to go.