It could be backlash.
When my youngest son was around 19 he hooked up with a woman that was my age about 39-40, and made me ill but I said nothing because the main thing they had in common was drugs, he supplied her, and she was pretty. My husband was having fits but my worries were more about him drugging and I knew that he would follow her like a puppy and I wanted to stay in touch with him. They were together for several years. She had kids, a daughter that is my son's age and a boy that was about 13-14.
He finally stopped drugs and they split up. He came back home, and she came over once, he told us to say he was not there so we did, she sat in her car in my yard till I finally went out and tried to tell her to leave but she had to smart off something about him and I slapped the h_ll out of her, then somehow she got a hold of my arm and bit me. We called the law and she got out of there pretty fast( she was spaced out on something and had a bottle of Vodka. Those were some crazy years.
Personally, I could not figure out how she could be with someone so young, and how he could be with someone his mom's age.
Years later when I got a divorce both of my son's friends hit on me every time I turned around but I was not interested. I liked men my age or older