I'm 22, and ever since I started learning about Pokemon on the internet (fairly recently, when I discovered bulbapedia), I have begun to like it even more than I did when I was younger :).
When I used to play, I had no idea what EV training was, I didn't know there was such a thing as competitive pokemon, and I had never seen more than maybe 3 or 4 episodes of the anime.
Despite the fact that I don't think competitive battling is for me (though I might not mind trying out one of those online simulations sometime), it somehow gives the Pokemon world that I grew up with more depth to know that that's out there.
I also really have enjoyed watching the anime. It's definitely not for everyone -- at some point, the episodes start becoming very formulaic, and I started to only watch the ones that had "Major Events" as reported by the summaries in bulbapedia, but I still like it for the most part.
I just wish I had some other game system than my old SP. I wish I had a DS to play gen IV games or a console game to play some of the other pokemon-based games out there. Unfortunately, I'm a poor college graduate who has only recently found a job, so investing in game systems is probably not a good idea at this point in my life :P. Someday I will, though!
Anyways, welcome to the forums, Jimmy :)! I hope you have fun :P.