I write to you, fathers, because you know him who is from the beginning. I write to you, young men, because you have overcome the evil one. I write to you, little children, because you know the Father.
Vs. 13b belongs to the Second Triplet in v. 14. Some would believe this to refer to actual "children," but probably it refers to the whole of Christian relationship. If the case is a reference to literal children we would expect a different order.