Younger boys

I don’t know but it is normal that I have crush on younger boys?All the boys I like are sophomores and I’m a junior.All my friends like older boys like 20-27 years olds.I find it really strange because we are underage and those boys are having jobs ect.And what’s even more interesting that those older boys aren’t just joking.They aren’t in a relationship with my friends but they have sex.