Is there any truth to the idea that women tend to only go for guys under 26 when seeking hookups? I have seen this suggested several times now. If it is true, can someone explain to me why? What does a guy under 26 have that I at 28 don't have?

It does seem like the only time I hear about stories of guys having casual hookups with women, it typically guys in their teens or early 20s and rarely guys older than that. It often seems to me like even older women only have casual sex with younger guys and have sex with men their own age and older only when it is in the context of a relationship. It actually seems like it is more often than not guys in their teens getting laid. Just look at the stories of teachers having affair with their underage male students. How often do 30 year old men get sex from hot women with no strings attached?