Dr. William Bell is 90 years old and can still pole vault better than you. By 'better', we of course mean 'at all'.
I'd like to say it's something I aspire to but, personally, I view retirement mostly as an opportunity to feign senility for personal gain and poop myself in crowded public spaces for effect. Follow your dreams, though, is the take-away message here, I think. Let's go with that.