
*sighs* if what I wrote was too long then just read this part and tell me if the math adds up
for Itachi:
4 (itachi's age sasuke just born)+8 (years after the fox attack)=12(his age then)
13(how old he was when he killed his clan) + 4(when he met back up with sasuke)=17 (itachi's age in part 1)
for sasuke:
17(itachi in part 1)-13(sasuke in part 1)= 4(how many years older itachi is)
13(when itachi killed his can) -4(how many years older itachi is)= 9(how old sasuke had to be when his clan died)
9(sasuke younger) + 4(when they met back up)= 13(sasukes age in part 1)
itachi was 4 when sasuke was born
itachi was 12 when he met up with madara and sasuke was 8
itachi was 13 when he killed his clan and sasuke was 9
itachi was17 in part 1 and sasuke was 13