Well I don't know about Tim but I know when I was thirty and had two kids I didn't have near the competitive spirit that I did at say age 21 or so.
Honestly though I think TD still has a competitive spirit. Sometimes I wonder if he doesn't get down for all the no-calls though. It has to be somewhat discouraging to constantly be fouled in the post and get to the line as little as he does. He is getting no respect this year.