I finally got my mother (77 years old) to start resistance training about 10 years ago. It's been GREAT for her, obviously. Her bone density improved from 60 to 70 by 13%!
Anyway, this is her absolute favorite exercise and she swears by it. She's closing in on 80 and still does her own lawn work, weeding, gardening, etc. and I'm convinced it's her 4x weekly resistance training sessions and nightly (1 hour on the bike) cardio sessions.
So, not just for football players!