Board Thread:Fanon Canon 2/@comment-25152698-20140921035237/@comment-25152698-20140921154903

Yes, that's all been taken into consideration.

Sayuri was born the night of the Uchiha Clan Massacre, (4 years before the start of the series). That would make her 4 during part 1 of naruto. Tsunade became the hokage after the initial invasion by Orochimaru, during part 1, where Sayuri would have still been 4. Around this time Sannoto would have left Tsunade to raise his child, she is still 4.

Part 2 timeskip, Sayuri would be 7, as the time skip was 3 years. War takes place, by the end of part 2, Sayuri is 9.

Fourth Shinobi World War ends, Tsunade dies within 2-3 years, which would make Sayuri 11-12.