Research
I have a good friend who is a professor emeritus from University of North Carolina. Perhaps his foremost work is a treatise on North Carolina Bar B que. “Holy Smoke”
At 75 or so, he and his wife still literally travel the world to teaching gigs at universities all over the world.
they worried about getting in a specific retirement community but it seems to me they are never at home, always on the road. The perks include paid retirement