I wish both you and your wife the best. I had to "give it up" when almost 70 yrs old (6 years ago), following a stroke. I was doing excellent physically and fully expected to be full time Rving into my 80's or even 90's. It was quite a blow to give up the best lifestyle, but eventually you find ways to enjoy life as non-RVers, although it's never quite the same (the call of the open road may always beckon). Nonetheless, life goes on and it's best to keep a positive attitude.
I sincerely hope your wife may see some improvement in her condition so you can both enjoy your golden years. :)
BTW, I'm single, so I'm not facing the same situation as you.