My brother always used to say "You can't really do anything about growing old, growing up however is totally optional".
Some parts of me are still a 14 year old girl, I kinda try to bump her up to the point where she can go out, visit a bar and not embarrass us.
I'm finding my second teen years to be much much better, aside from not getting beat up now I'm allowed to visit bars, I can afford to visit them and live in a reasonably nice place eating real food instead of craft dinners and no name noodles.
Then again, sometimes I wish I could go back, who knows, enjoy the moment and remember that growing up is optional, you are only as old as you feel.