So, my good friend (18m) had a falling out with his ex (19m) because the ex bullied him and also because he is apparently dating a 16f, so my friend thinks he is a pedophile for obvious reasons (adult + minor).
I can see why this would be considered bad but also, when I turn 16, my girlfriend will be 19 too, as I am currently a young sophomore who is about 3 years younger than her girlfriend, a senior.
I have no idea which part of the world you live, but here nothing of that is true most of the time.
That would be a love story between a first year and a last year student. Maybe unusual, but mostly doomed to last 3 months at best.
Indeed a 17-19 is more common, and 18-19 quite common, but I wouldnt worry too much. Monitor yes, specially if the 16yo is somebody I care for/of.
But child abuse? That’s a bit stretched.