"Age gap" by itself isn't an automatic red flag, and sometimes it's fine. And if everyone is consenting adults it absolutely isn't "pedophilia". But I will want to know more context and have zero problems judging someone in that situation.
Let's not pretend there's not a lot of "age gap" relationships where the older party isn't at minimum incredibly immature. And I'm talking about people 40+ dating people barely out of their teens.