I will say that is all very well and my aspiration too... My decision to retire a bit early was because of what I've witnessed in healthcare during the last few years. I'm not going to wait to enjoy myself.
Now the old-old are coming in and it isn't pretty. And I mean super-geriatric- 90+ is very common but only one in ten is anything close to what you might call vigorous for that age. And that is amazing in itself because most people in their 70's and early 80's are not doing well at all. Lots of dementia.
My uncle was actually very vigorous up into his early 80's until alzheimers got him. I'll admit he was tougher in his 70's than I was in my late 20's.