User blog comment:Thailog/Ep. 202 "Earthlings" discussion/@comment-5046454-20120506034329/@comment-5037637-20120506182834

@Theraptor92: It's because of his human and Kryptonian DNA being mixed together. It screws with his ability to age, but it gets fixed in the comics by Klarion- so hopefully that will come into play here somehow, especially since Klarion is an important villain in the show.