I agree that quality of life is more important than quantity. I intend to go out riding and hiking, dancing around and whooping it up and living life, not sitting on a couch or nursing my latest aches and pains.

I'm 59, and most days I have some aches and pains. Sometimes my wife says "... since that's bothering you, maybe we should not go (cycling, hiking, etc)". But if I sit out every time I "don't feel like it", it's going to be a downward spiral. The more I sit out, the worse I'd feel. Exercise keeps me going. I understand the need to rest and recover, and that some injuries or illnesses may put me out of commission at times - but as soon as I can I will be back in the saddle and living life to the fullest extent I can, until they plant me and cover me over.