I'm 22, also near 23, and love this show. I proudly wear a shirt with Jake and Finn in public. To put the icing on the cake, I even watch this with my girlfriend who's around the same age and she watched it even before we met. She does a great LSP impression. If you like this, you may like Flapjack. Its off TV and recently off verizon ondemand, but its hilarious.

Flapjack reminds me of Futurama in the sense that I didn't like it was first time I watched it, but did when I watched it again years later.