How Old Was Sasuke When He Killed Itachi

At what age did Sasuke kill Itachi?

Itachi died at the age of 21. He was about 17 when he returned to the Leaf Village to find Naruto in the original series. After the timeskip and about another year, Itachi let Sasuke kill him to unlock the mangekyo sharingan and paint Sasuke as a hero to the village.

How much older than Sasuke is Itachi?

Notes: Itachi is approximately 8 years younger than Kakashi and approximately 6 years older than Sasuke (dated by the Uchiha Massacre when Sasuke is age 7 and Itachi is 13).