science

Eh, when I was a kid, someone who's 70 seemed ancient.

Now I'm halfway there, and either I'm biased or there's more people of like shy of 80 still doing things.

Celebrities are clearly somewhat functional even at older ages.

Harrison Ford is still acting at 83.

So I'd say it's probably more or less up to what sort of care you have. Celebrities clearly will have a bit more than the average person.