what's your opinion on a 17 year old girl dating 15 year old guy

I get enough judgment just from hanging out with him as a friend.. I just wanted to know what everyone's opinion is on the age difference, also I'm not sure if I like him or not. I'm kind of just trying to figure out what I'm feeling before I make any decisions. maybe it's just right now it seems weird but if we were 21 & 23 it'd be different. I just want to know what your opinions are