16-19? Not pedophilia. Not literally nor legally, move on.
Pedophilia means being attracted by somebody who does not show sexual maturity yet, and I strongly doubt that I the case (I have a 16yo daughter, so...). And laws, usually, have clear exceptions for similar ages people like this, as it's expected and quite normal. I mean given how stupid males are at that age, he being 3y older alny means they are closer than two 16yo.
Are they both in school? Is there some power imbalance or abuse? Otherwise, move on and let them live their lives.