Birth-40, tents (or tentless on the ground).
Now, mid-40s, my minivan is easier on my body, but would not suit most older people.
Some people are tough, though. My dad backpacked and tent camped into his 60s, then bought a Scamp. But when his wife goes with him she sleeps in the Scamp and he sleeps in the truck bed with a small shell, because of snoring. Pretty similar to my minivan bed!
I have friend in her late 80s who van camped for years and is planning to go back to it next summer. She's looking for a Volkswagon van -- old school!