I'm mostly joking, but I still don't like it when people just disregard the conventions of my absolute favourite genre, especially not for such a weak reason.
It's heresy. If you're going to allow magical males, then why not allow over-sixteens? Or hell, magical dogs for that matter? You are tampering with forces no mortal man could possibly comprehend. Do not mess with the natural order of things, especially not for what is essentially a superficial difference in the end.