User blog comment:Waterkai/Timeline/@comment-3403804-20130608205850/@comment-951734-20130608213735

There aren't that much actual 'conflicts', the greatest problem is that everything is just very vague. For example: on your own page Isamu Yamanaka, it's stated that he was born shortly before the Fourth War. Considering he is 28 as of now, he would actually be born 9 years before the war. Now I don't really know in what sense 'shortly' is utilized, but I wouldn't call 9 years short. Kagerō Tsukagami is stated to have been born after the Fourth War, while he should have been 4 years prior. Yami Nara is said to become the leader of the Nara clan twenty years after the war, but given Fuyuki's age we are currently only in the nineteenth.

Also, not something we can do much about, but generally all the dates of events regarding Kirigakure are just very vague in the canon, and in some cases even contradict themselves (as I've noted on the Timeline with Zabuza's slaughter).