My own personal experience of this is as a woman who has dated a couple of significantly older men. Any inherent problems from the age gap in both cases were due to their hang-ups (beliefs from previous baggage) that had had time to be very set-in. But all people are different and I suppose I could just as easily have met an older man with no hang-ups. In my cases, they had both had a long period prior to me without being in a relationship. From the point of view of how others viewed us, I have to say we were definitely most comfortable in our own home.
Separately from my own direct experience, my Dad is 20 years older than my Mum, and they’ve been married for almost 30 years now (they met when I was young). I’ve never thought of them as looking odd or wildly different in age, even though they must do. They’ve worked through different issues, the biggest probably being Dad’s way of arguing – but that may be as a result of being a school headmaster as being 20 years older.
As you are the older, and female, I would only suggest that you check exactly where you are within yourself regarding children and whether that matches with his.
@rosehips don’t mind our @ucme – he has his own style of humour designed to make you curl your lip, but he’s just posing a tough exterior to hide the fact he’s a big softie when you get to know him :)