I ran from grade 7 until I was about 22. That's enough. I ran fast enough. What's the point, after a while?
I cycle and lift now. I'm about as fit as I ever was, just not as fast in running. I only come here for the conservative/white troll type posts and to stay informed about any other politics related discussion.
I should add, I feel somewhat sorry for the guys that never could give it up / move on. I have friends who still log over 100 miles each week trying to run, like a 2:19 marathon. I couldn't believe going through your late 20s/mid 30's without pursuing another athletic endeavor other than long distance running.