There's something else going on. Most of the generation I am in are fairly fit and look youngish from not being in the sun (more so than what my fat self would be if I didn't do granddad-speed triathalons). I certainly don't like standing as long as most retail pharmacists do. He' is also a late entrant. A lot of it is not eating crap food while at work, something that I definitely noticed as a difference between healthy and unhealthy pharmacists. It's too easy to fall into the trap, which was why when I practiced retail, I made meal prep style meals during that time.
The high-volume workers are running around and look ok. Maybe it's survivor bias?
I still do that despite my income during very busy periods in the university because I don't want to go out to eat or take too much time when there's a deadline on the table to get through. I always do that when I'm practicing within VA as the food quality within VA is substandard even for Sysco/US Foods. I think fondly of those meal prep companies now and would have been an addicted to that service had that been available at the time.