I was an athelete in high school & college, so I've worked out on and off most of my life.
Once we had our son my time was dedicated to him and the wife, so my workouts pretty much went away.
Move forward some 30 years and I see a picture of myself from a hike we were on and I said to myself, I have to get back into the gym... So at 55 I started all over again.

It just makes you feel great, and seeing the results totally make the effort all worth it.