I'm here in South Wales too. I used to be in Cardiff, but moved up by Caerphilly three years ago because the houses were so much cheaper and the commute was about the same once I cut out traffic from the city centre. I love life in the Cardiff area. It's perfect for me--lots of advantages of city life, a good cultural life, good shopping, good history, and yet small enough to personalise things and not get lost in a huge city. Cardiff is a great place. It has really changed a lot in the last 20 years or so as it's regenerated, so sometimes you'll hear a lot of people dissing it, but really it's a great place.
I know of a couple other Americans here and a few Canadians, but none of them are on UKY, just friends from other places. A lot of the others on UKY that I've know here have moved on for personal reasons. I'm not sure if there are many others. I think there are, but I'm not remembering names well enough at the moment to know if any of them are still around. I periodically will bump into someone on the street who's moved here from the States, but I didn't keep up with any of them. There aren't as many of us Americans here as you'll find in some other places--however, you can find plenty of places to get stashes of treats from back home, so let me know if you are looking for anything, and I can tell you if you will find it and where.
Oh, I'm soon to be 39, so not far from your age group. We have two little ones.