My DH is 12 years older than me. We've been married 16 years (mostly happy) and have two kids together. Met when he was divorced and I have one step-daughter. He's young at heart and I'm an old soul. He's the best husband and father I could ever ask for and my best friend.
He was the first person I ever dated that was that much older than me. I don't have issues with my dad. In the beginning, my parents were a little concerned as were one of his friends but no one ever treated us different or gave us strange looks. My parents adore him.
The only real issues we've ever had are starting to occur now. He's in his early 50's. You can see the age more in him now than in me and he is also starting to develop some health problems - high blood pressure (but you can have health issues in any relationship). I worry about him dying before me (it's irrational, you never know what tomorrow will bring but I think about it just the same). He's starting to get more set in his ways and I'm more open to change. I've also noticed that once we had kids and people get together as couples, it just seems like a lot of my friends pair off with "couples" where everyone is the same age. Doesn't really bother me, I'm more a just see my friends alone type of person than a group person anyway but it's something I've noticed. Really, they're not even "issues", just observations.
I don't feel like I missed out on anything by not being with someone my own age and would do it exactly the same all over again. We talk, laugh, get along great. Everyone that knows us says what a great couple we are. If you click with a person, age is irrelevant. Every couple has some issues from time to time and the ones that come with an age difference can be worked out pretty easily.