Some of it might be age. I didn't realize until recently what I wanted. Got a new co worker who's only a couple years older than me (I'm 46) and after a few days of working with her, I told her she's ruining my other friendships because I've realized how boring many of my friends are. She's just very easy to talk to and we can cover tons of subjects. We always have something to talk about.

I don't think you can expect someone in their 20s to really know enough about enough things to really be euradite about much. They also don't have as much experience talking with people to be remarkably eloquent. That's not to say that everyone younger than me isn't worth talking to, but maybe you're scouting in the farm league and don't know it. Keep talking to everyone though: one day you'll find someone you hope never stops talking to you.