Extreme stupidity on my part just ruined my relationship last friday so I don't know if anything I say will help at all or not.
However, I've dealt with more relationships in the past 5 years than I'd care to remember that were meant to be "forever".
I'd say if your having doubts, go slow and most definately talk things through with him. My main problem is I tend to be more mature than most people my age (despite how I happen to act, yes, I can be serious and mature when need be
), so that causes problems with relationships. Since you're both older and more mature, chances are you won't have that kind of problem with the childishness I've had to deal with in young women.
Communication has generally been my problem. If a girl doesn't open up to me and be honest and forthcoming, I tend to shut down to their level to keep from digging for things and trying to force them to talk. So, if you just have little personality quirks that are causing your doubts, chances are you can work that out. Sometimes those little things that frustrate you with your partner end up keeping a little bit of tension that can be fun to release though.
Money I've noticed is often a huge problem, so, if you are both self-sufficient then that is great.
The whole passion thing can be frustrating. I love giving girls attention and going of my way to please them. Some girls feel smothered by that, others just love it. I don't like feeling like I have to restrain myself around the person I love, so if that doesn't work for the girl I'm with, one of us ends up frustrated all the time. If you constantly have to initiate things, it gets to be...irritating. I've been there before. You know they enjoy it, but it's not the same having to constantly go out of your way to do that as having them start once in a while. It's nice to have the other person come to you occasionally too.
But, if you feel it's worth a try, then you should at least give it just that. Let him know you'd like to make things a bit more serious and see how that goes. I know I've said to myself I'd take things slow, and then rushed into things too fast as we both liked how it was and then it blew up in my face. Pacing things is hard sometimes when you enjoy what your doing together.