All depends on what kind of condition you're in. The gym I go to has quite a few folks in their 80's and 90's that do some serious , and regular workouts ! They totally inspire me .

The less you do over time - the less you'll be able to do. Use it or lose it.
You're still a youngster by comparison - keep it up !

Your body will tell you.

I'm 74 and ride 80 to 100+ miles a week. (4 or 5 rides), so at 60ish you probably have a bit to go.

That's a discussion you should have with 1) a MD and 2) a certified and educated (degree in something related to the body and exercise) personal trainer

Wondering the same ..for the same reason. Been staying active with outside physical projects, and only start up some kind of calisthenics when inside and inactive. But I get that ‘how much is too much’ feeling

Keep it up I did not because of injuries and now I am paying for it. However recognize that your body like a car is wearing out and adjust your workout accordingly. Semper fi