My wife is 57, her current bf is 29.
She was reluctant to meet him, at first, because of the age difference. However, he has turned out to be very mature and laid back for his age. He's about 6'2", lean and muscular with quite a bit of ink. His appearance can be very intimidating to some, but he's like a big teddy bear.
He and I get along very well, and he treats my wife with the utmost respect. He's a professional welder and very handy around the house. I love it when he stays a night or two, with my wife, when I'm away. Not only is he taking care of her sexual needs, I know she's safe.
We are the third married couple he has been a bull for, since he got divorced. However, he has been with us longer than the other two. I think the key is there is little to no drama in our threesome relationship. My wife and I would love for him to move in with us.
His stamina is amazing. It takes him forever to have an orgasm, but he stays hard and can fuck for well over an hour. Then, he bounces back very quickly.
Because of his job and custody with his daughter, he only manages to visit a couple times a month. But, when he does, he literally destroys my wife's pussy for hours.
He's built like a beer can, as my wife puts it, lol. He's only 7-8" in length but very thick.