Average age of wife’s lover.

We are late 50s. Our friend is 35.
He is definitely NOT the type she says she's attracted to. She likes men or age, well dressed and not overweight. Clean cut and well groomed.
Our friend is clean. Skinny nerd type body. He has a big dick. He looks good standing with a full hard on.
My wife very obviously likes sex with him. His dick size probably has a lot to do with it but he's a super cool guy and she likes him for that.