I'm "only" 34 and I too want to ride sportbikes for as long as possible. I've been working out regularly though for the past 20 years. Been a strict vegetarian since 1995. So people often mistake me for being 8-10 years younger. But damn, I do notice how my body has changed. I need more warm up time in the gym before I lift anything heavy, and I need way more time to recover from injuries. Time stops for no one......so have fun while you can!
Oh, and to the youngins.....respect your elders, you too will be old one day