Agree. There's lots you can do to slow the affects of aging. Most of us just don't try.

I'm 55 and found - much to my surprise - that 12 months of carefully progressively and intense running training has improved me from a slow plodder (jogging 5km a couple of times a week) to on track for a 3 hour marathon later this year. Along the way, I'm back to the weight I had in my early 20s, but now also am a lot faster and with way more endurance.

Of course, at 55, I now need to be more careful now about not getting injured. Which means being disciplined about stretching, strength training and recovery. Things I never needed to worry about when I was younger.

So absolutely:

> Use it (with proper care and feeding) or lose it.