If this is from Thirteen Days... I think it boils down to, don't get shot down and don't report it, otherwise the US would respond with war...which is what we tried to avoid during this time period.
Answer:
When Itachi was first shown in Anime series, where he was teamed up with kisame to capture naruto, he was 17 at that time. Later on in sasuke vs Itachi final fight , Itachi was 21yeared old. He is six years older that Sasuke. Actually when he killed his clan, he was only fourteen.
Explanation:
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