The older you are the less that age differences are seen as weird (relative to the same difference).
Example, a 15 year old having a crush on a 13 year old is considered somewhat weird while a 45 year old having a crush on a 43 year old is not.
But in my opinion, theres nothing particularly wrong about it..
(if it makes you feel any better, when I was 15 I was dating an 11 year old... honsotly I didn't know at the time though, I thought she was 13, but appearantly she lied, and it wasn't until we broke up that she told me how old she really was... it kinda pissed me off)