The most important thing you learn as a sports photographer is anticipation - not where the action is taking place but where it's going to take place. Not where the subject is now but where they're going to be.
Why do people talk of the horrors of old age? It's great. I feel like a fine old car with the parts gradually wearing out but I'm not complaining ... Those who find growing old terrible are people who haven't done what they wanted with their lives.