Board Thread:Versus Debates/@comment-26704954-20160301064038/@comment-3965545-20160303013153

Hiruzen was only around 12-13 when Madara "died" at his battle with Hashi at VotE, and wasn't even an official Genin until he was 15-16. Prime age is 31-49 according to Danzo, Kakashi and Tsunade's comments. You also have no proof that Dan ever saw Prime Hiruzen battle period. He only saw Hiruzen in his physical prime. Hiruzen being Hashi and Tobi's student has seen them battle, that's for sure.