Is it normal for a 28 yo to have a relationship with a 19 yo girl?

Hey I've been dating this girl for a while now. We like each other a lot and get along pretty well despite the age gap. I know that there aren't any moral issues since a 19 yo girl is still an adult although a developing one.

This is a first time experience for me. I never even had interest in someone much younger than me.

Would like to hear some perspectives and if you went through something like this at some point