I have heard a lot of chatter on the subject, but I've never seen the answer stated outright (or with any proof). The youngest I've seen reference to was Kakashi. He was a chunin at 6, a jonin at 10, and joined ANBU Black Ops at 13.
Itachi, on the other hand, became a chunin at 10 and became a Captain of ANBU Black Ops at 13. He's still pretty amazing, but Kakashi was younger.
· 9 years ago