I'm turning 49 in two weeks and just gotta say: I feel better than I've ever felt. I started lifting seriously 2 years ago after NOT having stepped into a gym in 17 years! I worked with a personal trainer (who was 21!!) and made it my goal to be able to do what he does (maybe not the weight but all the exercises). I lucked out in finding a guy who knew what he was talking about. I've never been injured. We now hit the heavy bag and do martial arts fighting.
My body fat is now 9%, I weigh 195 and my one rep max is 265! I have now started studying to get my certification as a personal trainer (NASM). I'm planning for a very active retirement and a new career!! feels great