Running past 30

So today was our school track meet. It was a great day to be outside and see the students bustling with activity and energy. I ran the 800 a 4X100 and 4X400 relay with the teachers. I also signed up for my first official track meet in 12 years on May 8th. I have yet to give myself an honest answer to why I am doing this. I think a lot of it has to do with always wondering how fast I could have run had I not been injured after high school. In some ways I feel like Uncle Rico, sad but true. As if I have enough time to train thoroughly with a full time job, young family, and a dozen other pursuits racking my mind. Perhaps part of me refuses to accept reality. Perhaps its pride. Or maybe I just need to prove to myself that I can "hit" a certain time. But why? Why do I have this need? Is it childish or honorable? When I accomplish it, what's next? a faster time to achieve? Or can I finally hang up the spikes and just run for spirit, sweat, and stress sake. I'm hoping for the later as this mentality can be exhausting.