I was watching Ironman Kona last night from last year, which once again featured Lew Hollander.
This guy is 80 years old, and he's still out there giving it. I don't think anyone would guess his age looking at him, he's spry.
"If you want to be functional at 80, you better damn well pay attention at 40"
Words to live by!
You see a lot of older gentlemen in the gym who you can tell are only there because a doctor told them they had to be. They're carrying a gut, they're winded, clearly not fitness nuts... until they were forced to be by their first heart attack, knee replacement, etc.
Get on it now, reap the rewards the rest of your life. Your 80-year-old self will thank you!