>I cannot fathom people who go to extreme lengths of diet and exercise in a futile effort to prolong their lives. No one lives forever. You will die, no matter what you do to put it off. Why would you want to exist in suffering for extra years instead of just accepting your exit gracefully while you're still a fully functioning human being?
I've known people who lived well, well into their 90s before a quick decline. The retirement home was a very brief stop for them, because when they went in it was because their bodies were already failing.
With good genes, a good environment, and taking care of yourself, you can have a couple of decades of life and experience beyond 70.
You only get one go... why waste any of it? Rotting in a retirement home is generally a default choice by people who don't know what to do with themselves without someone telling them first.