The Justice League is one of the greatest assemblages of heroes of all time. They've faced down every threat the DC Multiverse has thrown at them and come back for more. It doesn't matter who or what they fight, they always win in the end. Through a combination of sheer power, experience, and skill, there's no force that can stand against the Justice League for long.
One of the biggest mysteries about the team, as with many comics, is just how old the members are. With DC, it's actually easy to figure out, though, as it's been established that Dr. Manhattan pruned ten years out of the fifteen-year timeline of the DCU. Using this, one can get a ballpark of how old the most important Leaguers are.
10 Green Arrow Is Close To Forty
Green Arrow has always been one of the older DC heroes. It's often been played as a joke, especially when writer Brad Meltzer referred to his having a bald spot being the reason he wore the hat. By the time he became Green Arrow, he was already a well-known playboy millionaire, most likely in his mid-twenties at the time.
Green Arrow was anywhere between twenty-three and twenty-five when he put on his costume, so he's in his late thirties. At the youngest, he's around thirty-eight and the oldest is forty, which is pretty impressive considering his line of work.
9 Black Canary Is In Her Mid-Thirties
Black Canary is one of the League's most potent weapons. She's an amazing martial artist, and her canary cry gives her the extra oomph she sometimes needs in battle. On top of that, she's proven to be an amazing leader and mentor to younger heroes, passing on what she knows. She can handle just about any mission and has years of experience.
While the sliding timescale of DC puts her position as the daughter of the Golden Age Black Canary in question, she's somewhere in her mid-thirties, having started as a superhero in her early twenties, possibly as young as twenty.
8 Martian Manhunter Is Centuries Old
Martian Manhunter is one of the Justice League's most powerful members, which is saying something on a team with Superman on it. J'onn J'onnz has one of the most formidable varieties of powers out there and he's used them to save his adopted homeworld many times. He's also way older than he seems.
Martian Manhunter was born centuries ago. He was brought to Earth in the 1950w by Dr. Erdel's transmitter machine, which grabbed him through space and time. So, while he didn't experience all of that time, he's actually much older, as he was equivalent to a middle-aged human at the time, putting him in his eighties or nineties.
7 Aquaman Is In His Early Forties
Aquaman is one of the most powerful aquatic superheroes in comics and has been with the Justice League since the beginning. A founding member of the team, he was around twenty-five, possibly slightly older, when he first became a hero. Add fifteen years to that and that puts the King of Atlantis in his early forties.
Because of his mixed heritage, Aquaman is still relatively young for his age but he definitely has the experience and curmudgeonly attitude of a man in his forties. He's gained a lot of experience and this had made him a great hero and king.
6 Hal Jordan Is Very Immature For Someone In His Mid-Thirties
Hal Jordan is one of the greatest Green Lanterns of all time and he's been doing it for a long time. Another founding member of the team, Jordan was an Air Force test pilot when he gained his Green Lantern ring. Assuming Jordan joined the Air Force out of high school, which is in character for him, and he got the ring in his early twenties, as young as twenty, he's now in his mid-thirties.
Jordan hasn't really grown much as a person in all of that time, which isn't exactly weird for someone his age. He's still rather arrogant and standoffish, but he's more than proven that he's a great hero.
5 Wally West Is One Of The Youngest Members The League Ever Inducted
Wally West has proven to be the fastest Flash over the years and it's actually kind of easy to figure out how old he is. Wally gained his powers at age ten, within a year, possibly two, of when Barry gained his. He spent his teens with the Teen Titans and was in college when Allen was killed in Crisis On Infinite Earths.
He was around eighteen or nineteen at that point. So, taking into account his age when he started and the fifteen years time period of the modern DC Universe, Wally is in his mid-twenties, possibly a little older but not much.
4 Barry Allen Is Inching Towards Middle Age
Barry Allen kicked off the Silver Age of superheroes by taking up the mantle of the Flash and running with it. He was already an established forensic scientist at this point, meaning he had graduated from college and been part of the Central City police force for several years. His degree took at least four years, possibly longer for anything more than an undergraduate degree, so he was probably close to his mid-twenties when he joined the force.
Figure a few years after that and Barry is now comfortably middle-aged. At the youngest, he is almost forty and at the oldest is over forty. The Speed Force does retard aging, so he definitely looks younger.
3 Wonder Woman Is Hundreds Of Years Old
As far as pinpointing Wonder Woman's age, it's a little tricky. Her origin has been changed so many times that it often depends on the continuity, with her soul being millennia older than her body in the post-Crisis George Perez reboot. At this point, most agree that she's hundreds of years old, having spent most of her life on Themyscira.
She came to Man's World in WWII for the first time and has been around ever since. She's proven to be one of the Justice League's most important heroes and is usually the oldest person on the team, although her Amazon immortality will keep her young and spry for basically eternity.
2 Batman Is Older Than Most People Expect
Batman is one of the most impressive members of the Justice League, a regular human who battles some of the dangerous villains around. He's also definitely older than most expect. Figure he left Gotham to go around the world and learn things when he turned eighteen and spent about five years abroad, at minimum. Add another year or two before he actually becomes Batman and then add the fifteen years.
So, this should put Batman around forty but wait, there's more. It was posited in multiple continuities that Batman had been working in the shadows for years before other heroes showed up, so add another five years, at least, and that puts Batman in his early to mid-forties.
1 Superman May Be Older Than We Think
Superman is DC's ultimate role model and for years, most readers just assumed that he was in his mid-thirties to early forties, like most of the DC's current A-list heroes due to the sliding timescale. However, it's also impossible to know exactly when Superman was born. A timeframe for when Krypton was destroyed was never established. It has been established he was in stasis the whole time, so it's entirely possible Superman is well over a hundred years old in "real-time" years, even if he's only lived for eighty to ninety years.