Thanks all. I'm glad to not be alone in this.
I also notice that I'm more careful on stairs than I used to be. I mean, I still run up and down them, (I like to take advantage of every opportunity to exert the ole' bod for additional exercise!) but I hold the handrail now. I never used to do that.
And though I don't have knee issues, there's a bit of arthritis I think. Getting up from a squat takes a bit more work than it used to. If there's a piece of furniture handy, I'll use that to help push myself up.
I shouldn't complain. I'm blessed with better health than some of my dear friends who are struggling. But I can't help comparing myself now to the self I used to be. And I suffer in that comparison!!