I'm 50 now, which makes me a decrepit old man by Slashdot standards...
I'm 65, and by my standards you're still a kid. I have a number of chronic medical conditions, including osteoporosis, but I still stand straight and don't need a walker, or even a cane. You don't have to be decrepit by the time you're ready to retire unless you don't try to take care of yourself or your health is considerably worse than mine. (Until recently, I was taking 33 pills/day, all but four by prescription.) Yes, it's nice to know that these devices may soon be available for those who need them, but it's even nicer to know that for now, at least, I'm not one of them.