when i was in high school there was no way i'd date someone a grade lower..  it's like a double standard that it's ok when the guy is older but an older girl is pretty weird..

i did change my mind at 20... i realized that a year younger isn't too bad.. if i was a teen again i wouldn't have a problem dating someone a year younger but 2 years makes a difference.. when you grow up each year is significant.  there's a difference between a 17+16 year old than 16+14.. 

i think that if the feeling is mutual go for it.