Watch the late scenes from the movie Tommy. Daltry climbs to the top of a mountain on large boulders like he’s walking to his car in the driveway - I doubt he even noticed it was nearly vertical.
I later heard that he was the only rock musician from the 70s who managed to avoid the drug scene...
Angus Young of AC/DC is famous for being a teetotaler -- neither alcohol nor drugs, ever in his career. AC/DC started in 1973 so they're arguably "from the 70's" though they got going later than the Who by a decade.