Although our neighbor's don't have kids at home (we're in an older neighborhood), I've fantasized about my ice with three of our son's friends. They're in their 20's and are great kids. Always "flirting" with my wife. Either one on one, a MFM , or all three with her in a gang bang. I'd either watch, or get all the details afterwards. They'd come around more often without our son for repeats. When I'm on the road I fantasize that she shagging one, two, or all three of them, and that gets me off.
She's normally pretty shy around them (the motherly side of her) but she seems to like the attention.
My wife is in her 40's, although he was a neighbor, she has had several guys in their 20's. Youngest she has had was 18... poor kid talked a big game... after the 1st round he was spent!!! Lol
I agree so would I, especially if it is someone living with parents. Though I expect the teenage boy liking an older woman is not that unusual.