What you're essentially saying is it's inappropriate for someone to date someone a year and 2 months younger.
Like your about to graduate, and pretty close to being an adult.
And you hook up with someone whose practically a kid.
Gender equality is also a slight social issue here (not that I care about it here).
As a young guy dating an older girl is looked higher upon. Sorta like the boy who hooks up with the hot female teacher is seen as lucky.
I think freshman/senior relationships are destined for failure. The senior guy has the freshman girl's best interest in mind. He's not just looking for an easy freshman girl to have sex with. I would hate for my son to be labeled a pedophile over something like that.