Also, all you geezers out there want to help the knees?
Go down (or up) the stairs backwards (use handrails), you’ll be surprised at the difference it makes. I’ve had three knee ops, I know.
FWIW ... Many years (decades?) ago I ran across an article about knee pain and paid attention ‘cause I was beginning to notice a problem. I don’t recall everything, but one change I made was that, when walking downhill or down stairs, do it with the ball of the foot first instead of the heel first. When going downhill, it looks a little silly, but it worked for me. (Someone said that the Indians (feather) have always done this. I dunno...)
It helped a LOT. Also sent the article to my brother who had huge problems, and he was fine within a few weeks.