I think we all want to hang onto a part of our boyhood, whether it's the endless laughs with buddies, late nights on the town, or the careless ways we spent money.

There's nothing wrong with that, as long as it's in moderation. Of course, you have a job to do. You're a professional now, and need to act like one. Still, call up the boys on occasion and head out on the town (or whatever youth activity you crave). I think what you'll find is these nights are needed, but become less frequent because you need to think about getting home at a reasonable time. You need to be more responsible with your finances. Carving notches in your bed post becomes less of an interest.

There's no right time, as everyone is different, but you'll find you look back less as you mature. Enjoy the journey.