Sitting around and doing nothing (or driving around the country in an RV, etc.) is the most depressing thing I can think of doing. I hope when I'm >65 I am still working, if not in an operational role, in some kind of investor or advisory role.

Retirement from a physically demanding job makes sense when you can't do that job any more, but enduring a job/life you hate, just to reach (hopefully) retirement and finally enjoy life, really seems like the wrong model.