User blog comment:18emerc/Superboy and his abilites/@comment-50.14.65.44-20130223013850/@comment-34954086-20130225010916

Or, he could be fine other then the aging. If he had a limited lifespan due to some anomaly, do you not think that Star Labs and the League would have found the problem, using any combination of magic, science, GL Alien Anatomy Buddies, to fix it by now?

The same could be said for Atom's shrinking, Plastic Man's elasticity and shapeshifting, Captain Atom's radiation or Flash level speed, such powers would cause insane damage to any real body. But, they're fine because the kinks were ironed out by their powers. Any problem that could exist either doesn't because he has powers to correct it, has some bizarre twist of fate causing him not to be affected or because they've taken steps to counter it.