Not very old. Sai is seventeen and Naruto is sixteen. He's a year older than Blondie.
A year older than Naruto and Sakura, he is seventeen.
It depend what you think. like i think in the first episode he was 12. and when Sakai left he was 13. and now in naruto shiputon he is 16. don't believe me do the math.
sai is a foundation member who works for danzo currently sai is in team kakashi, and sai did not try to kill naruto he was testing his strength according to sai
http://naruto.wikia.com/wiki/Sai
Sai is no match for naruto because naruto has resagan and he has the nine-tailed fox in him. naruto can make multi clones and that takes a lot of work. naruto can turn himself into Sai by using his clone justu. So Naruto is way stronger then SAI . Sai thinks hes better than naruto but he is weak
No.
Sai holds it in his pocket.
http://naruto.wikia.com/wiki/Sai
Sai does not wear glasses.
in chapter 286, sakura hears the conversation that goes on with naruto and sai.
Naruto meets Sai right after returning from his mission to save Gaara. In the manga that would be book 32.
well, naruto shippuden episode 1 has sai in it, but only because it is a preplay of the future. the first time that naruto actually first meets sai is naruto shippuden episode 33 or 34.
No, they are allies.
naruto shippuden