Bump.
@ everyone: another proof just came to mind. In this scan:
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Itachi is stated to be 'barely 4 years old'.
This can help. Let's see, Itachi's age at part 2=21
16 years ago, the kyuubi attacked. 21-16= 5 (itachi was 5 during the kyuubi attack)
When he was 4, the ninja war was in progress, so 5-4=1.
A year after the end of the 3rd shinobi world war, the kyuubi attacked.
Since Kakashi was 14 during the attack, that means when kakashi was 13 the 3rd ninja war was taking place.
But that's not all.
Carefully read what Tobi said:
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'
During the 3rd shinobi world war, Itachi,
barely four years old, witnessed countless people slaughtered in cold blood'
During the 3rd shinobi world war, Itachi was 4 years old. Meaning during, or
for the duration of.
What this scan says is , really: 'for the duration of the 3rd shinobi world war, Itachi was 4 years old'
Meaning the 3rd shinobi wolrd war only lasted for a year. Here's the definition of 'during':
Throughout the course or duration of
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There is a second definition, but it cannot apply. Because Tobi just said that
during the 3rd war, Itachi was 4.
Had it been said: 'itachi got wounded during the 3rd shinobi world war', this can mean at any time in the shinobi war and does'nt specify time. But when it says 'during the war, itachi was 4 years old', it HAS to mean 'for the duration of'.
In other words, its just been proven that the 3rd shinobi world war lasted less than a year, while Itachi was 4. And the battle of the Kannabi bridge occured in the same war, meaning Kakashi was 13, and therefore the same age as Obito.
P.S: This is confirmed when Tobi says that for a 4 year old, war is hell. Meaning Itachi was only 4 years old while the war happened, not less or more.