You guys need to learn how to take care of yourselves.....
I'm nearing 60, and aside from a recent knee injury, and the other one having some relatively chronic pain that hope to rmemdy via holisitc means, and a couple other minor irritations, I'm able to do most everything I could when I was young, only with more skill and the benefit of years of experience, knowledge, training, and learning. There are few who are capable of keeping up, regardless of age.
Exercise, proper midnset, and proper nutrition are key. I only have 10 and a half years to go to reach my goal, which is to drop a 30 footer into deep powder...and ski away...Of course to do that on my birthday would mean I'd have to have traveled down under. Las Lenas doth beckon!! or New Zealnd's Remarkables.....