According to the databook
Naruto, Sasuke and Sakura + rookie 9 & Lee, Karin, Suigetsu are all 17 y/os
Hinata is 16 y/o (turning 17 on December 27th)
Neji and Tenten is/was both 18 y/o
Juugo and Kankuro are both 19 y/o
Deidara was 19 when he died
Temari is 20 y/o
Kakashi, Guy, Asuma and Mizukage...