Board Thread:Wiki Discussions and Support/@comment-26152226-20150323185045/@comment-26302001-20150323191814

Him becoming Hokage 14yrs before Naruto was born is simply a DB4 Error. It would be impossible and in order for Hashi to spoil Tsunade she would of had to be at the least 1yrs old. When Naruto was 15, a manga chapter cover page indicated that Hashirama died 50 years prior, so Hashirama would of died 35 years before Naruto was born and Tobirama was Hokage immediately after. Tsunade was born 38yrs before Naruto was born. So she was indeed old enough to be spoiled(3yrs old) before Hashirama died, then Tobirama took over until around 3 years later and then Hiruzen became Hokage and later the Sannin's sensei. I believe he was confirmed to be a Hokage and the Sannin's sensei at the same time in one of the fanbooks or databooks.