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The Definitive List Of Stranger Things Characters’ Birthdays: The Confirmed Dates, Plot Holes, And Season 5 Ages

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The world of Hawkins, Indiana, is meticulously detailed, but one of the most persistent mysteries for fans isn't a monster from the Upside Down—it's the official birthdays of its beloved characters. This deep dive, updated for December 2025, compiles every confirmed, semi-canon, and most-accepted birthday for the main cast, detailing the in-universe ages they'll be heading into the final season, Stranger Things 5. The show's timeline moves slowly, with Season 4 taking place in the spring of 1986, meaning most of the 'Party' are now about 15 years old. We've got the one confirmed date, the one confirmed date that was immediately forgotten, and the best guesses for the rest.

The Duffer Brothers have only explicitly confirmed a few dates, leading to years of fan speculation, prop analysis, and even a famous plot hole they've promised to correct. Understanding these birthdays is key to grasping the characters' ages and emotional development as they face the final battle against Vecna.

The Confirmed & Canon Stranger Things Character Birthdays

While many dates remain a mystery, two characters have definitively canonized birthdays, thanks to on-screen dialogue and crucial props. These dates are the bedrock of the Stranger Things in-universe timeline and character ages.

Dustin Henderson: May 29, 1971 (Confirmed)

Dustin’s birthday is arguably the most solid piece of character trivia in the entire series. During the pivotal moment in Season 4, Episode 9, "The Piggyback," Dustin's girlfriend Suzie is forced to use her knowledge of his personal information to access a computer. She confirms his full date of birth as May 29, 1971. This makes Dustin a Gemini, and he was 14 years old during the events of Season 4 in 1986.

Eleven (Jane Hopper): June 7, 1971 (Semi-Canon)

Eleven’s canonical birthday is derived from a prop seen in Season 1: a missing persons poster. The poster lists her date of birth as June 7, 1971. Although the Duffer Brothers or official tie-in media have not explicitly stated this date in dialogue, it is widely accepted by the fandom and the Stranger Things Wiki as her in-universe birth date. This means Eleven turned 15 in the summer of 1986, and she will be 16 years old during the events of Season 5, as the final season is expected to take place in 1987.

The Infamous Will Byers Birthday Plot Hole & The Duffer Brothers' Promise

The most talked-about birthday in the Stranger Things fandom is undoubtedly Will Byers’—not for a dramatic reveal, but for an embarrassing oversight in Season 4.

Will Byers: March 22 (The Forgotten Date)

For years, fans believed Will’s birthday was March 22, based on a fan-created timeline and a popular Reddit theory. However, Season 4 delivered a major continuity error. The events of the season take place in March 1986, and Episode 2 shows a video camera recording the date March 22. Will is clearly in the scene, and yet no one—not Mike, not Jonathan, and not even his mother, Joyce—mentions his birthday.

The Duffer Brothers later admitted in an interview that they had genuinely forgotten about Will’s birthday. They called it a "mistake" and a "sadistic" oversight, confirming they would address the continuity error in a future season, likely by retconning the date in Season 5. While Netflix's social media has previously wished Will a "Happy Birthday" on March 22, the Duffer Brothers' promise to fix the plot hole means this date is now in flux, making it one of the most anticipated retcons in the series’ history.

The Older Kids & The Rest of The Party: The Best Guesses

For the remaining main characters, official dates are scarce, but their birth years and approximate ages are known, allowing fans to pinpoint the most likely month or season for their birthdays. These are based on in-universe age progression and secondary sources.

  • Mike Wheeler: April 7, 1971 (Fan Consensus)

    While a few theories exist, the most popular and consistent fan consensus places Mike’s birthday in early April. This would make him an Aries, and he would have turned 15 shortly after the events of Season 4, putting him on track to be 16 in Season 5, like the rest of the Party.

  • Lucas Sinclair: May 5, 1971 (Fan Consensus)

    Lucas's birthday is often linked to May 5th in fan discussions, placing him as a Taurus. This date is consistent with the general 1971 birth year of the younger kids, keeping him the same age as Dustin, Mike, and Will.

  • Max Mayfield: 1971 (Approximate)

    Max is the newest member of the Party, introduced in Season 2. Her age is consistent with the other kids, meaning she was likely born in 1971. Given that she is the same age as the rest of the core group, she would have turned 15 in 1986, and will be 16 in Season 5. No specific day or month has ever been mentioned on-screen, making her birthday one of the biggest question marks.

  • Nancy Wheeler: November 1967 (Approximate)

    Nancy's birth year is 1967, and she is noted to have a November birthday, which would make her a Scorpio. She was 18 during the events of Season 1 (1983) and turned 19 in Season 2 (1984). She was 19 in Season 4 (1986) and will be 20 years old in Stranger Things 5.

  • Jonathan Byers: Fall 1967 (Approximate)

    Like Nancy, Jonathan was born in 1967, with his birthday placed in the "Fall" season, possibly making him a Libra or a Scorpio. This would put him around 19 or 20 years old during the events of Season 4, making him approximately the same age as Nancy.

  • Steve Harrington: 1966 (Approximate)

    Steve is generally considered to be a year or two older than Nancy and Jonathan. Born around 1966, he would have been 17 in Season 1 and was 20 years old in Season 4 (1986). He will be 21 in the final season, placing him firmly in the "adult" category of the main cast.

  • Robin Buckley: 1968 (Approximate)

    Robin is roughly the same age as Nancy and Jonathan, placing her birth year around 1968. This would make her 18 during the events of Season 3 (1985) and 18 or 19 in Season 4 (1986), depending on when her birthday falls. A popular fan theory places her birthday on October 4th, making her a Libra.

The Stranger Things Character Ages In Season 5

As of this update, the final season, Stranger Things 5, is expected to take place in 1987, following the massive two-year time jump between the real-life cast and the in-universe characters. This means that by the time the final battle for Hawkins begins, most of the main characters will be one year older than their Season 4 ages, regardless of where their specific birthdays fall within the year.

The 'Party' (Eleven, Mike, Will, Dustin, Lucas, Max) will all be approximately 16 years old. The older teens (Nancy, Jonathan, Steve, Robin) will be approximately 20 or 21 years old. This age gap is a crucial element for the final season, as the younger characters will be approaching legal adulthood, while the older group will be fully in their twenties, bringing a different level of maturity and experience to the fight.

The biggest question remains Will Byers’ birthday. Will the Duffer Brothers retcon the date to avoid the Season 4 plot hole, or will they simply have the characters celebrate a belated birthday in Season 5? The answer is one of the many secrets the final season holds.

stranger things characters birthdays
stranger things characters birthdays

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