Why do some men and I seem to have a huge age gap?

I'm a woman with learning disabilities and I'm 24 years old. I've had some experience with some men but they're not looking for anything serious. It's difficult to meet guys my age but they're not interested in a long-term relationship. I also encounter the problem that men I meet in social events seem to have a huge age gap. Having a little age gap is fine with me, but I don't want a man twice my age. Men outside of my age range don't seem to attract me. Although I am fine with men in their 30s and 20s, it seems that I don't get anything out of either of these age groups. When I can't go younger, but can't go much older, what is my best option?

Obvious question. Why socialise with much older men?