Board Thread:Questions and Answers/@comment-3001900-20131024200959/@comment-3001427-20131025184353

You are also forgetting that both Zaraki Kenpachi AND Unohana Yachiru/Retsu were ~2100 years old as well. Kenpachi looks like a well worn veteran but only in his mid 30's, whereas Unohana hasn't aged a day. Its all relative and subjective, but its to be expected in a spiritual setting. Nothing is ever as it seems and the laws that govern our world are NOT the same as it is in the spiritual world. Given that, its impossible to determine the exact rate at which a Shinigami ages and how much they change during that period of time. Look at Rukia, she looks like she's barely legal, maybe pushing 14 or 15, yet she's ~150 years.