I got braces when I was 35 or so -- soon after I finished law school and had the bucks. I was very happy! Be diligent about your hygiene at night and it will be ok. I got an oral-b electric toothbrush--one for home and the other at the office.

*and* I dated with braces. In fact, my partner and I got together soon after I started wearing them--we've been together 14+ years now.

Every adult I know who has had braces has been happy with the outcome.