I am a nontrad at UF. Honestly, the age thing doesn't factor in after the first few weeks. Your friends are your friends. Period. I choose not to hang out with skirt-chasing booze hounds... and I have found those come both in the newly-minted college graduate variety as well as the nontrads. Similiarly, I have befriended some younger students who possess amazing maturity and composure, as well as non-trads.
At UF, we've formed a non-trad student organization this year and it has been a great way to bring the non-trads together.
There are a lot more of us than we think! Non-trads tend not to be as socially involved with the law school, or more conscious about making a spectacle of themselves in class. So they try harder to fly under the radar in order to not stand out as non trads. We non-trads also keep our noses buried in our books during 1L b/c our mission is to kick butt in school. We're not as concerned with the student bar association socials and pub crawls.
Go with the school that will get you where you want to go, career-wise. It's only three years. The rest of your life and career are much longer.