Board Thread:General Discussion/@comment-4620155-20130410100635/@comment-7658432-20130410101841

Exactly the same reason why Unohana, Urahara, Yoruichi, Yamamoto, Kyoraku, Aizen, Isshin, Ukitake and Tessai look the same 100 years ago. Seems like aging is slowed down when you're a spiritual being.