It's important to keep a little child alive inside us!
I do it by still playing games that was really dear to me when I was a kid. That's The Pokemon games! ;D Love 'em! And I know I'm not the only adult/almost adult playing them.
How boring life would be if we just concentrate on "adult stuff" like job and family without anything that takes us to something completely different. Maybe another world. May that be music, games, books, or whatever!