If my calculations are correct, Itachi assassinated the Uchiha clan when he was 13 years old, while Kakashi was 22 years old. We also know that Yamato is four years younger than Kakashi. Therefore, Kakashi must have been 20 years old when Itachi joined Anbu, as he spent two years in Anbu from the age of 11 to 13. Yamato had been on Kakashi's Anbu team for two years when Itachi joined, which means that Yamato joined Team Ro when Kakashi was 18, making Yamato 14 at that time.

Assuming they met three years before Yamato joined Team Ro, it is reasonable to say that Kakashi was 15 and Yamato was 11 when they first met. Can you confirm if my calculations are correct, or if I have made any mistakes?