I'm 66 and still strong as a horse. We have a fully landscaped 1 acre property, which I designed, built, and maintain. I'm a long distance road bicyclist. From March to October I ride about 150 miles per week, the more challenging the ride the better (I used to ride about 350 miles per week). And I meticulously maintain our fleet of four vehicles, even hand washing washing the undercarriage on one of them!
So, I still feel capable, except for my aches and pains and the fact that some of my more challenging bike rides kind of take it out of me now and then.
One thing about being older and retired, an afternoon nap once in a while after busting your butt doing something physical is a genuine life pleasure!
Scott