Board Thread:Questions and Answers/@comment-26848457-20150802191529/@comment-70.199.2.117-20161216203240

He is likely a half-human, they're more common and don't have kagune but do have inhuman strength speed and most likely a healing factor plus if they are similar to qx then eating human flesh would make them stronger. If Uta is half-human to fit in with ghouls would tattoo his eyes. his rapid aging can be covered up with hair dye or maybe the flesh consumption slowed it.