User blog comment:18emerc/Superboy and his abilites/@comment-50.14.65.44-20130223013850/@comment-432124-20130225005727

Just because the gaps have been bridged doesn't mean that he's perfectly fine. Remember that his DNA was cloned by human scientists who had very little idea how to work with Kryptonian DNA and thus, he has his aging condition as a side effect and possibly other side effects that haven't been disclosed as of yet.