Board Thread:Questions and Answers/@comment-24749544-20140505080714/@comment-24384892-20140518041504

Firemonkeyjoe wrote: Maybe Reiryoku has something to do with aging. The more you have the slower you age. My thoughts exactly.

It would explain why Yamamoto has lived for over 2,100 years and looks like a late 70's/early 80's man. He's known for possessing an immensely high reiryoku even by captain standards.