I'm 18 and I've been talking constantly to this 29 yr old. Which eventually led to us both liking each other. Is it okay to give him a try and date him?

Just remember guys like this are out for only one thing.  This guy should be able to find someone more his age that he can relate to unless he has a problem so he goes after the younger females otherwise he would be taken unless he's gay. So please just be careful here and don't do anything you don't want to and trust your gut feeling here as the heart has been known to and does lie.  Good luck

Yes. You are both 18 or over, so it is okay.

Yes if you both care then give it try, just don't rush things too fast.