[ How has he lived this long and never seen a human...or wait no, if he spent all his time guarding a magic puddle no one was allowed to come see that makes sense. Never mind. ]

Well yeah but like...I'm just taller? And more mature, obviously. [ That part's debatable. ] We're not that different after we grow up. It's not like we started off immortal or with...tons of culture, I guess? I guess it depends which planet you're from.