Comment by bluGill
The right level is hard though. I know more than one old person who spent time in a hospital because they thought they could do something they couldn't and broke their bone. "For $20 they would install the new dryer, but no we thought we could do it and that is how my foot got broke in the fall". You should have a cane handy when you need one, but don't use it if you don't need it.
I have no idea how to find the right balance.
Accidents are almost always bad, for sure. Doing things that you are physically capable of, though, is rarely a problem.
The perception of things like weightlifting being dangerous or bad for your back though are almost entirely a myth. It is possible to screw it up, but from what I've read it's very rare for people just lifting things to hurt themselves.