Yeah you're too old. It's not like 30 year olds play this or anything. Just go back to playing FPS like a real mature man. Nah man. There's no such thing as too old. And I wouldn't get Red/Blue if I were you. Those are the worst games ever.
Never to old for your hobbies, and the pokemon game series have a few complex systems in place to keep you interested. If you like it you like it. that's all there is to it...worse case scenario just buy it and don't tell anyone :P
It's natural for your interests to change as you get older, if you no longer have the same interest in the series, I wouldn't blame anyone for moving on. But at the same time, if you still enjoy the games, it really doesn't matter how old you are. 17 is still pretty young, there are plenty of fans out there twice your age.