This is a timeline I put together using birth & death dates of Naruto Characters, as well as estimated timelines for characters on Leafninja.
I thought It would be useful to OC creators to have, at least, an estimated timeline for the series. So here it is.
If anyone knows something else that would make this more accurate, feel free to comment it.
Kakuzu B: 91 ybss
Kakuzu Age 20: 71 ybss
Chiyo B: 70 ybss
Hiruzen B: 68 ybss
1st Shinobi War estimated start: 56-55 ybss
Jiraiya B: 50 ybss
1st Shinobi War in progress: 48 ybss
Hiruzen becomes 3rd Hokage: 48 ybss
Tobirama D: 48 ybss
1st Shinobi War ends: 48-47-46 ybss
Hiruzen Senseis Jiraiya: 44 ybss
Jiraiya Genin Age 6: 44 ybss
Minato estimated B: 34 ybss
Sasori estimated B: 32 ybss
2nd Shinobi War begins: 30-28 ybss
Sasori creates the Mother & Father puppets: 27 ybss
Asuma B: 27 ybss
Kakashi B: 26 ybss
2nd Shinobi War ends: 26-25 ybss
Jiraiya Senseis Minato Age 10: 24 ybss
Kakashi Genin Age 5: 21 ybss
Kakashi Chuunin Age 6: 20 ybss
3rd Shinobi War Estimated Start: 19-18 ybss
Sakumo Hatake D: 18 ybss
Itach B: 17 ybss
3rd Shinobi War ends: 13 ybss
Itachi Age 5, Sasuke B: 12 ybss
Kyuubi Attack: 12 ybss
Uchiha Massacre: 5 ybss
Naruto Series Start ---
Naruto Leaves: 8 months after Series Star
Naruto Returns: 2 1/2 yass
ybss: years before Series Start
yass: years after Series Start