Neither do I as I am unaware of their laws on such things. If I wanted to be speculative I would assert a world where someone can be 6-11 means age in a relationship means much less than in our world.
And even in our world there are plenty of places the two of them could fool around and it wouldn't be a problem legally.
Though then again, playing devils advocate against myself, the very fact Enid sees it as some kind of problem does imply there is at least a stigma SOMEWHERE. Whether it is legal, cultural, personal or something else is up for speculation.