User blog comment:Ziwantan/The 5 most powerful sorcerers in Misplaced/@comment-4789909-20120209210051/@comment-1038387-20120209210554

Klarion is not a child... he is ageless.

As for Mordred (I think you mean him, not Mordru), he was depicted as a child in Justice League and Justice League Unlimited, but in the comics, he's only had a handful of appearances and most of them depict him as an young adult (and strangely, all but one of them are Vertigo, not DC proper).