...First there's a boy, and he grows up to be a man. Then there's a girl who grows up to be a woman.
The two meet, and SOMETIMES get married. Then a little boy or girl gets found in the cabbage garden, or a stork brings it over.
Thus ends Biology 101.
Well, according to the flashbacks, I'm not at all sure that's accurate in Daimien's case, anyway.
The problem is that Daimien's certainly older than Batman's career, as the new timeline demands. Which, actually, could work, but exactly HOW it works is pretty up in the air.