My hubby is 45 and I am 39. He has wet dreams. He was at his doctors a while back and after he was seen for the rash he had on his arms and elbows, he asked her about the wet dream thing. She, his Doctor, told him that it isn't nothing wrong with him. Some men do have wet dreams after the early teens and after they mature. She also asked him if we were active, which he answered that we are. She said there isn't any thing that she could give him for it and don't worry about it.
So, I have a man that is 45 and has wet dreams maybe once a month to once every two or three months. Each time we wake up and he has had one, I always ask him what he was dreaming and he like most folks don't remember all the dreams.