Board Thread:Naruto Discussions/@comment-3965545-20150817023148

We know it was the day after his 12th Birthday(August 10th) and he was already a Genin, his Ninja Registration ID being 005350 which is 2 numbers after Mikoto Uchiha who's was 005348 meaning they were more than likely in the exact same Graduating class from the Academy. Mikoto was 35 at death and would of been 41-43 when Itachi died and 42-44 when Naruto and Sasuke lose their arms if she was alive at those points. 