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Doesn't Know Their Own Birthday

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"Today's my birthday?"

Jennings: When's your birthday?
Mark: Oh... I don't got no birthday. At least I don't know when it is.
Jennings: How old are you?
Mark: I don't know. Maybe eight or nine. Something like that.
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Maybe they grew up an orphan, maybe they have amnesia, or maybe they just grew up in a society that doesn't celebrate the day someone is born. Either way, this character doesn't have a birthday. This usually comes as a shock to their peers.

Oftentimes, the character will be assigned a birthday based on an important date in their life. It may not be their real birthday but the idea is still the same. Sometimes, their friends, being shocked that they have Never Had A Birthday Party, will also throw them a party.

May lead to Vague Age. If the character doesn't remember their birthday, this often relates to a Mysterious Past. One of the reasons a character may have Never Had A Birthday Party. Often caused by the same reasons a character was Never Given a Name. Compare Forgotten Birthday for when a character's friends/family forget their birthday. This may also go along with a Birthday Hater.

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Examples:

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    Comic Books 
  • Honey Badger doesn't know her date of birth, being a clone. The Stepford Cuckoos have a similar predicament, but decided to arbitrarily pick a day based on the birth date of their favorite actor.
  • In Supergirl: Being Super, Kara doesn't know her birthday or her exact age. She was a refugee from another planet who suffered amnesia. It's assumed she's around sixteen.
  • In All-Star Superman, our hero doesn't know when his biological parents' birthdays are, so he's arbitrarily marked two dates six months apart as the days that he'll celebrate them. Since he's the only one observing themnote , it doesn't really matter.

    Fan Works 
  • A RWBY fanfic written before it was revealed that Blake isn't an orphan revolved around Blake being a Birthday Hater because she didn't know her own birthday.
  • As Emerald was an orphan before Jaune adopted her in Relic Of The Future, they celebrate the day he met her as her birthday instead.
  • Likewise in A Monster's Marriage, Jaune decided on May 10th for Emerald's birthday since she didn't have one before they metnote .
  • Applies to Celestia and Luna in the Triptych Continuum. Justified because keeping exact time in the Discordian Era was impossible: they know they're about two years apart, but they don't have recorded birthdates because there was nothing to record them against. (Any given location was lucky to have seasons.) There are dates on which their birthdays are celebrated, but those come from the consensus of the herd.

    Films — Live-Action 
  • In Crocodile Dundee, Sue at one point asks Mic how old he is. His reply is that he once asked one of the tribal elders when he was born and was told "in the summertime."
  • 16 Blocks: Eddie reveals towards the end of the movie that he doesn't know when his birthday is, due to a troubled childhood.
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    Literature 
  • In the autobiographical book They Cage The Animals At Night, Jennings' friend Mark has lived in orphanages his entire life. He doesn't know his birthday or even his exact age.
  • In the Treehouse book "The 52-Storey Treehouse", Andy and Terry don't know their birthdays or how old they are, so they decided to add a room to their treehouse where it's "everyone's birthday even if it's not" and create an official "proxy-birthday" for both of them to share.
  • In Loskutik And The Cloud, Loskutik, a poor orphan who has lived her entire life as a servant to abusive masters, doesn't know when her birthday is.
  • In the first Red Dwarf book, while applying to the Space Corps, Lister gives his date of birth as "unknown", due to his being found in a cardboard box under a pool table.note  When asked when he celebrates his birthday, he replies "most of the time". Eventually the interviewer puts 14th October, based on the fact that he was found in November and believed to be about six weeks old, but it's pretty much just a guess.

    Live-Action TV 
  • Space Cases: In "It's My Birthday, Too (Yeah!)", it's revealed that Radu doesn't know his birthday because those of his kind are born in hatcheries, and he lies that it's his birthday so he can have his first party.
  • Jack in Power Rangers S.P.D. says that he doesn't understand why Syd is upset when he makes her work on her birthday. It's eventually revealed the reason for this is because he doesn't know his own birthday. By the end of the episode, she decides to share her birthday with him.
  • Agents of S.H.I.E.L.D.: Daisy Johnson/Skye spent her whole childhood frequently changing among foster families without ever knowing her biological parents, therefore she never knew her exact birthday. When she manages to reunite with them she learns that her birthday was on July 2nd and that she was born in 1988, and not in 1989 as she believed.
  • In the Grand Finale of M*A*S*H, B.J. couldn't make it home in time for his daughter Erin's birthday, so the camp cheers him up with a birthday celebration for a Korean orphan whom they claim was born on the same day as Erin. They later admit that they have no idea when the Korean orphan was born, and they just selected a child who looked to be the right age. B.J. is still touched:
    B.J.: What better birthday present to get than your own birthday?
  • I Dream of Jeannie: In the two-part story "The Girl Who Never Had a Birthday", Jeannie tells Tony that she does not know her birthday. However, she does know that Neptune was in Scorpio on the day that she was born. Tony and Roger try to find out the date of Jeannie's birthday by feeding this information into the NASA computer ERIC. After several failed attempts to access the computer, Roger finds out the date but Dr. Bellows ships him off to Alaska before he has a chance to tell either Tony or Jeannie. He eventually returns two episodes later in "My Master, the Great Caruso" and tells Jeannie that she was born on April 1, 64 B.C.

    Video Games 
  • BlazBlue has a variant. Noel was told by her foster-parents that her birthday was December 25, and that's where her name comes from. She was actually smelted on January 7th. The other birthday was implanted, along with all memories of her childhood, to disguise her age even from herself. The games imply her friends continue to celebrate her birthday on Christmas because that's Noel's birthday and Clones Are People, Too.

    Visual Novels 
  • Wilhelm Ehrenburg from Dies Irae was born into destitute poverty during WW1 and post war Germany, and as such, there are no documents of his birth and his family was a pretty dysfunctional one as well so they didn't really keep track, something he notes wasn't uncommon during that time. He believes he was born sometime in 1917 but admits that its about the best guess he can manage.

    Web Animation 
  • Strong Bad Email: In "cheatday", when asked about celebrating The Cheat's birthday, Strong Bad admits that no one actually knows when The Cheat was born. So they just celebrate his birthday on the one day they're sure it isn't—the date listed on The Cheat's (obviously fake) ID card.

    Web Comics 
  • Slightly Damned: Buwaro dosen't know when his birthday is, on account of him being orphaned before he hatched and Darius having stopped recording the date by the time he found him.
  • In Goblins, Minmax tries to find something "normal" about Kin, but gets irritated as she comes from such a wildly different culture; she doesn't even know her own birthday. Minmax debates what to do about this, ultimately deciding to give her one "normal" thing: a birthday party.

    Western Animation 
  • Bob's Burgers: The premiere episode "Human Flesh" reveals that Bob is so absent-minded about dates he not only forgot Linda's birthday once, but his own.
  • The Transformers: One episode reveals that Ultra Magnus dosen't remember the date of his own creation so Wheelie and Daniel set out to find it.
  • Harvey Beaks: Because they lost their parents at a young age, Fee and Foo don't know when their birthday is, and have never had a birthday party. Harvey attempts to throw them the best "first birthday" he possibly can in "Fee and Foo's First Birthday".
  • Steven Universe: In "So Many Birthdays", as Garnet and Pearl were born on another planet, Amethyst lived alone for a long time, and all of them predate modern calendars anyway, Steven makes up a birthday for the three of them.
  • She-Ra and the Princesses of Power: "The Sword, Part 2" implies Adora doesn't know her birthday, because thanks to her sheltered upbringing in the Horde she doesn't understand the mere concept of birthdays.
    Bow: No birthdays? How is your life this sad?!

    Real Life 
  • Mosuo writer Yang Erche Namu has no known birthday and does not even know her own birthday, as Mosuo traditionally do not record them.

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