I don't want to be a complete jerk, but this sounds like a wife question. If you enjoy what you are doing there is no age of submission. You continue on your path until YOU are bored or no longer interested. Fantasy football is nothing more than an extension of that dream you had as a young kid. Dreams of Larry Csonka, Eric Dickerson, and LT2. Don't let anyone take those away. YOU WILL NEVER BE TOO OLD!!!!!!
"Advantages are taken not handed out" J. Hetfield