Y am I Getting so Old?

In the quest to stay in shape we have found the indoor track in the field house to be very useful. We live just across the street and it shouldn't be that difficult to make time to go run, but for some reason it is. This week I started out strong I ran for an hour and half Monday, then Tuesday, and Wednesday, I don't know if I was tired or what but I ran around the track and before I could get around once there would be people that have done two or even three laps. When I run on the street I don't realize how slow I run when people pass me because it only happens once, on the track it just keeps happening. There is that one girl, you know the one with the pony tale and the pink running shoes, that has to show you up. I bet she passed me 10 times, and her pace never changes from full stride. I feel like a grey hound on the track trying to catch up to the rabbit, I just never quite get there. I have arrived at the ripe old age of 23 and I am just happy that I am still walking. Y am I getting so old?