The things that cause many to curtail or stop RVing as we age are individually different. For some, it's losing interest, for others it's physical limitations, and there are cognitive issues. Cognitive such as recognizing danger & following directions etc.
Oh and there is the money, it ain't cheap for diesel and Rv parks
I'll be 83 next Dec and probably not what I was in my earlier yrs, but I try to compensate. I don't drive a thousand miles or at night. LOL
Still going tho, just not near as often as I'd like to.
The main cause of our cutting back is all of our traveling friends have either died or aged out. We thank God every day that we are still in pretty good shape, so many people our age are either sick or gone.