75 here, and riding a bit less than I used to. Not so much because of any decline in abilities, but because the deterioration of my hearing creates great inconvenience. I am now totally deaf in my left ear and down to about 40% in the right. I now have a cochlear implant for my left ear and wear a high-powered hearing aid in the right ear.
It is the hardware that is the problem. My old hearing aids were compact enough that they didn't cause significant problems when worn under my helmet. The new hardware -- the ear-hung CI processor and magnetic headpiece, as well as the newer hearing aid -- are much more massive, and wearing them under any helmet I have yet found is extremely uncomfortable if not outright impossible.
So, I now ride without hearing assistance. If I'm riding with my wife, communication with her is possible only with sign language. I'm pretty much unable to hear sirens and car horns. This makes me feel unsafe. If I need to converse with someone at a stop, I need to fish my hearing aid -- at least -- out of my pocket and insert it... a pain in the ass.
So... I've been riding less because it's less fun and spontaneous. A year and a half ago, my wife and I bought each other a shiny red Mazda Miata roadster for our anniversary. We both had owned Miatas back in the '90s and remembered them fondly. With the top down (which it nearly aways is), it provides much of the open-air thrills of the Vespas, but with the obvious shortcomings of being a car instead of a scooter.
I guess I'll have to make do with appreciating the advantages of both!