The Canon Batman Timeline
It's important to me that even comic characters can age and grow.
TLDR: I think the best way to plot out a Batman timeline is to pay attention to the ages of characters over time.
Batman: Year One, Catwoman: Her Sister's Keeper, The Long Halloween and Dark Victory all take place consecutively and over the course of Batman's first 5 years.
Bruce Wayne is 25 when he returns to Gotham on Jan 4, Year One, and likely turns 26 that year. Selina Kyle is 19 during Year One.
Dick Grayson becomes Robin at 13 in Dark Victory, towards the end of Year Five and spends 6 years as Robin.
Adapted Silver Age stories follow Dark Victory.
Dinah Lance becomes Black Canary and co-founds the JLA at 19, early in the Silver Age.
Barbara Gordon becomes Batgirl at 18, after the Teen Titans have formed, likely around around Year Eight. She is in-between Dick and Dinah's ages.
Adapted Bronze Age stories begin in Year Ten, after Dick leaves for college at 18.
Helena Bertinelli becomes a vigilante at the end of summer in Year Eleven, after turning 21, returns to Gotham and begins calling herself The Huntress in Year Twelve, after Ash Wednesday. She meets a 29 year-old Catwoman, who she's around 8 years younger than.
Dick is fired by Bruce at the end of Year Eleven at 19. Dick becomes Nightwing and Jason becomes Robin in early Year Twelve.
Crisis happens in Year Twelve and the Modern Age begins. Dick turns 20 around this time.
In Year Thirteen, Death in the Family, Killing Joke, Huntress (1989), A Lonely Place of Dying and Cry of the Huntress occur.
Barbara becomes Oracle, Tim Drake becomes Robin at 13, Stephanie Brown becomes The Spoiler at 15 and Jean-Paul Valley becomes Azrael as a post-graduate student. Dick is 21.
Knightfall takes place, over the course of 6 months between Year Thirteen and Fourteen.
In Year Fourteen, Prodigal, Contagion, Legacy, Cataclysm and Aftershock occur consecutively.
It is also in this year that Helena and Barbara join the JLA, Barbara forms the Birds of Prey, adding Dinah, and Tim co-founds Young Justice.
The entirety of Year Fifteen is the No Man's Land year.
Helena becomes The Bat, in Batman's absence, while also moonlighting as the Huntress.
Stephanie Brown gives birth at 16 and Cassandra Cain becomes Batgirl at 17.
The Titans form again, Donna Troy turns 23 and she is the same age as Dick.
Year Sixteen begins with New Gotham and ends with Infinite Crisis. Cry for Blood, Outlaws, Joker: Last Laugh, Fugitive/Murderer and Family occur in this year.
Renee Montoya turns 29, Cassandra turns 18, Tim turns 16 and Jason would have turned 18.
Helena joins the Birds of Prey, Tim joins the Teen Titans, Dick joins the Outsiders and Stephanie has a stint as Robin.
Year Seventeen is the 52 year and is largely a timeskip. Kate Kane becomes Batwoman and Renee becomes The Question.
Year Eighteen opens with One Year Later.
Final Crisis occurs and Bruce "dies". Battle for the Cowl occurs.
Dick becomes Batman and Damian becomes Robin, at 10. Dick joins the JLA.
Stephanie becomes Batgirl at 19, and Tim becomes Red Robin.
Michael Lane becomes Azrael at around 30 and Kate turns 32.
In Year Nineteen, Bruce Wayne returns and begins Batman Inc.. Cassandra becomes Black Bat.
The Black Mirror, Gates of Gotham and Leviathan Strikes occur.
The Convergence timeskip begins.
Towards the end of Year Twenty, Convergence concludes and so does Post-Crisis continuity.
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