Board Thread:General Discussion/@comment-24726378-20150102200745/@comment-1970092-20150107040409

It's possible that Yamamoto is still older. He wasn't always a Shinigami. At some point, we can imagine that he got together with Oetsu and Ichibei form Soul Society. Nimaiya making their basic weapon, with Ichibei naming it (and other things). But I do believe that strictly agewise, Yama is likely the older of the three, with them being all in similar age grouping~