You're still a young man! Cleanish living and you definitely got your exercise. Now, the gym has replaced working-man-full-body-workouts. Doing pretty well, myself, at 72.
Saw The Flag at Cafe Au Go Go in Winter, 1968. Rumors were Hendrix was jamming with them, and would play with them during this run. Didn't happen. But, they did play together a few months later at the Fillmore East.
The Flag had chops! round this time, after Bloomfield quit/was fired, Super Session was released. Stephen Stills, Al Kooper, Mike Bloomfield and members of The Flag. I still play that one.
Later was Bloomfield/Kooper at the Fillmore, with the classic "Hey Jude/Mr. Fantasy" pairing.