Keep it if you can. It is a lot of fun to look back and realize how much they change over the years.

I wish I still had a couple of my older bikes, just to see if they really were as cool/bad as I remember. Unfortunately, I didn't always buy the best locks.

One bike I particularly miss was the first one I had bought with my own money. The lock and chain were so cheap that the thief cut it into a dozen pieces as if to show me just how easy it was.