And at St Pons in the south of France we met a French couple in their nineties, who had a motorhome. They drove no more than 50 km a day between sites, and spent from March until the end of September every year 'on the road'. They were both fit and well, and obviously had a great time.
We made friends with them, though they spoke no English, by making a fuss of their little dog - who loved us. We got 'chatting' and had a coffee with them, and a couple of glasses of wine one evening - and we managed 'proper' conversations with our limited French. We discovered a shared interest in wildlife, and brought out all our nature books, comparing names and information - especially when he found the most beautiful moth at the back of his van!
So you've still got thirty years or more!