Then nobody takes care of you once you turn 85 and you shit yourself every time you fart.
I don't want to have kids, but let's not pretend it is paradise. I see what my father does for my grandparents, and I couldn't remotely imagine what they would do without him.
So yeha, if you want to live until you're very old, it won't be a fun ride. Your only alternative is to be rich and hire nurses that do whatever you need, and hope they won't take advantage.