8 years old because in part one sasuke was 13 and itachi 18. Giving that itachi killed his clan was he was 13 आप subtract 18 from 13 which gives आप 5 giveing the difference in age. Finally आप subtract 13 and 5 to get the finnaly answer of 8. Its a tough सवाल आप cant find the answer any where soooo आप have to relay on figure it out another way
10 because नारूटो was 10 when he left with jiraiya to train for two years and sasuke was older than नारूटो and their team went on mission for 3 years unto sasuke left and their both 16 now.
