[ZTAngel]

Try roommates.com. You can meet your potential roommate before they sign the lease and make sure that they're not a serial killer. I think roommates.com even lets you search by age.

You're not crazy for not wanting to live with a 20 year old. Their mindset is completely different than someone in the working world. Looking back at my 20 year old self, I could never live with someone now who is the way I was back then! I'm not saying that all 20 year olds are like that but the majority probably could never understand what it's like to have a full time job and huge responsibilities. Keep looking for someone closer to your age group. You'll thank yourself later down the road.