...Climbing on my Massage Therapist soapbox...
Something to ponder: I meet older people every day that don't have an ache to complain about. I meet younger people that complain more than anyone.
I've seen 80 year olds that are more active than most 20 year olds and 20 year olds that sit around like lumps on a couch.
The act of "aging" doesn't have much to do with pain at all. It's the fact that as time goes by, muscles that have been sore get worse, and you notice them more. If you put off getting things taken care of that hurt NOW, imagine how those same things will feel in 20 or 30 years (after you've been using them the same way for 30 years without attention). We shouldn't ignore our bodies because when something hurts, it's trying to tell us something.
In an informal poll, conducted by me, over the past 4.5 years, I have learned some interesting things. Regardless of age, clients that hurt the least have one thing in common: they stretch. Pilates first, then Yoga seem to keep people feeling best. The worst: people that do aerobics or other high impact exercising like running. Also toward the higher end of the pain scale are those who work out with weights regularly w/o stretching. And, most people that lift weights think they're too cool to stretch.

So, to those of you crying about how much you hurt because you're getting "old", think about your pain...if you've noticed it for a while but have been ignoring it, it will be there in 30 years like an old friend. You'll be seeing doctors for surgery and blaming a certain incident or sport instead of the way you treated your body.
I see it every damned day and it's sad.
...Jumping off my Massage Therapist soapbox and trying not to break an ankle in the process...