Frankly, I am pretty sure I would have that reaction, too. I don't want to be old and the thought of not being able to do what I do now is extremely disturbing to me. Since I am already old in years, this is a problem. I know it's not a positive attitude to have, but I know so many people who are 60-80 years old and still are running marathons and riding 5-10K miles a year, that I know what is possible. Some of these people have had their "things," with medical issues, but they all come back in one way or another. I suspect that if I became disabled in some way, I would try to find a way to do sports that my disability allowed. Until then, my goal is to keep doing what I do, maybe more slowly.