Board Thread:Naruto Discussions/@comment-26479810-20180620141830

I was watching some episodes of Naruto Shippuden and i noticed Hagoromo face changed in to old man-like face,his cheek and whole face skinnier. After that training,his face never get back into his original young face. Because of that,so it is not because he wasn't eating,drink. I think it is because of the Sage chakra inside him. Do anyone have some clues to unsolve this ? 