Furthermore, Jason might be considered quite weird. But since you think that someone who interacts with another person whose not of age in your country, let me give you the official definition of paedophilia.
"In which an adult or older adolescent experiences a primary or exclusive sexual attraction to prepubescent children."
Prepubescent meaning children who haven't reached puberty, which I assume, when Emily is 15 or 16, she almost certainly has.
In some countries, like Mali for example, longer age gap relationships are more supported. I'm not saying I don't think what Jason did is weird, and I'm definitely not saying he's correct, but he doesn't deserve to be called a paedophile, or have that title for the rest of his life.