I don't feel quite like an old timer, but since a lot of late 40s and early 50s types are responding, why not?
I started a little late (18-19) some 30 years ago, and never have quite outgrown the desire to train and compete. I think a lot of it comes from not coming close to reaching potential while in college, when it sort of counted. Plus I just like to get outside and train for its own sake.
Maintained a decent level of competive running (at a local-sub-regional scale) for more than a decade after college.
Since my late 30s I've had to steadily work harder to run slower times. Now I train as hard as I did in my 20s (almost twice as much as my late 30s) to run times that would have pissed me off in the latter decade. Nevertheless, I've been quite surprised to obtain high masters rankings off of what are some pretty mediocre times. It's like, hey, where did everybody go? Now I'm an age group nerd.
Thinking more and more about just getting into fitness running, and then using energy to coach my own kids and others.