How old is every one in the show naruto?

It depends if you're talking about Naruto or Naruto Shippuden.

In Naruto:

Naruto, Sasuke, Sakura, Shikamaru, Choji, Ino, Hinata, Kiba, Shino & Gaara = 12-13

Neji, Rock Lee & TenTen = 13-14

Kankuro = 14-15

Temari - 15-16

Kakashi & Gai Sensei = 26-27

Shizune, Asuma & Kurenai Sensei = 27-28

Tsunade, Jiraiya & Orochimaru = 50-51

Kabuto = 19-20

Itachi = 17-18

Iruka = 22-23

Konohamaru, Udon & Moegi = 8-9

Anko = 23-24

Third Hokage = 68-69

*For their Shippuden ages, just add 2-3 years.

You can also checkout naruto.wikia.com

Hope this helps!!! :-P