My opinion is no..he has mentioned he used to do powerlifting when he was younger and the gym is a stress reliever for him still...just years of consistant working out I bet. Plus he works with his hands.
I knew this 54yr old steel worker back in my construction days that had one of the biggest upper body I've ever seen..and he eats like a freaking horse so maybe the job plus the appetite and some good genes worked out for him?
Just my $0.02