Im 28 now and I feel better than I did when I was in my early 20s. The key is living a super healthy lifestyle, eating right and drinking tons of water. Stretching and staying active are so key. the reason so many older folks look like death is cause they sit at a desk all day and let themselves go to hell, and then when they're not doing that they are doing other unhealthy things like drinking, smoking cigs, and taking "meds" to get them right, all while living off a shitty american diet. I was certain I was pretty done skiing after I blew my knee at 18, those following seasons were painful. It all comes back though if you want it, Im having more fun skiing now and getting tricks back I haven't done in years, and learning new ones. Skiing is the most rightious lifestyle!