On the topic of them being older,
If Ludwig did have horns kinda like his dad's, you think his hair would cover them up,or they'd show? I guess they'd probably be covered up at first, but become visible as they grew....or maybe he'd get a haircut,God forbid...I like his hair the way it is.
He might also trim the horns, but that might be against Koopadom's traditions or something...and he'd have weird circles where they should've been on the sides of his head.
~Time for Winx to shut up...for now~