I don't know about smarter, but the maturity issue I can see, sure. All the guys I was talking about who are younger than me and would like to date me don't like the "drama" that comes with dating younger girls. Lots of them have been toyed with too much by younger girls and think that I'm a refreshing break because I'm honest, I don't play, I'm not a control freak, I'm not jealous, etc.
LOL. All the guys that currently have crushes on me (that I know of) are younger than me. Mostly by more than five years. Yeah I'm not sure what's up with that.