Board Thread:Naruto Discussions/@comment-1758775-20151007125942/@comment-2125188-20151009035852

GreatestSin wrote: DuelMaster93 wrote: But those 3 attempts all happened during the same year. Naruto & Sasuke both started the same year and age and graduated the same year and age. It's not like he had to stay back and attempt to graduate again the following year. isnt sasuke one year older?

No, they are the same age. I'm guessing Sasuke could be a few months or weeks older, but definitely born the same year. Everyone in the rookie 9 are the same age. It was also stated in the Chunin exams that Team Guy, who graduated the year before, were all 1 year older.

So yeah, I think it's safe to assume that (just how regular schools operate) there is a set age for you to enroll, with a few exceptions enrolling 1 year later or earlier.