How old is Naruto throughout the show's timeline?


I am curious about Naruto's aging through the series from Naruto to the
beginning of Naruto Shippuden. From what I've gathered Naruto's birthday is in
October.

Under the assumption that he was 12 at the start of the series. I think it
went something like the following :

  * Age 13 during the Chunin Exams
  * Age 14 when Sasuke left the leaf
  * Age 16 when came back from training with Jiraya 

Can someone confirm if this is correct?




From the [Naruto wiki](http://naruto.wikia.com/wiki/Naruto_Uzumaki) (Part II
as in Shippuden):

[code]

    Age   Part I: 12-13  
          Part II: 15-17
    
[/code]

So by the end of the manga/anime, he's 17 before the larger timeskip.

Also, there was a good answer by Mike Ante on another [related
question](https://anime.stackexchange.com/questions/14910/what-is-the-
estimated-age-of-naruto-when-he-became-hokage).

