I'm about to turn 70 and I'm single. I drive a 'C' and pull a Jeep Wrangler toad. The steps seem to be higher than I remember them and I need to add more driving direction details than I used to, but when I get to the point when its too much trouble, I'll quit traveling. I like having my "stuff" with me.
I traveled for the company during my working years ("Retired" @ 52"). Even high end hotels are too filthy to remove your shoes. The walls are only slightly thicker than a bed sheet and I was always next to a loudmouth drunk. The sheets get changed every second or third day, even though the price doesn't change. And eating in a restaurant by yourself is really boring.
I was flying in increasingly smaller seats, even in first class. And since I lived in Cincinnati, I had to change planes in Atlanta even if I was flying to Dayton, 50 miles north. And rent a car.
And all travel was dependent on weather. So is RVing to some extent, but I don't drive to Alaska in December or Florida in August.