Hey Ashnic,
I don't wanna ruin your happiness in any way, but I think you should listen to your parents. I think you are love-blind right now and nothing anyone says against it would make much sense. I do also think he is too old for you. I'm 26 (
http://www.members.aol.com/ilievbub/...iev/index.html) and I think I'm way too old for you, let alone 29. I also don't like his letter where he talks about sex. That could imply insincere feelings. When I'm in love with a girl, the last thing on my mind is to have sex with her. Just holding and kissing her hand is enough for me.
I think you should do whatever you decide, but I can give you 99.9% that this relationship won't work/last. For real, listen to your parents, one day you'll realize that they were right. I have been 18 before, and I know what it feels like to know that you are right, but now I see how wrong I was and wish I had listened to my parents - they have lived through it, they have made mistakes and learned.