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- The anniversary of Ash and Pikachu's meeting is celebrated at least twice, but Ash is still 10. Heck, according to how many episodes there are, if Ash had a new adventure every single day (and certain episodes take place over multiple days already), there is no possible way he could still be 10 years old. Yet he is still canonically 10 years old.
- An episode of XY reveals Jessie recently had a birthday however we still never learn her age (though early material heavily implied she's around 25). Considering Ash, it's probable Jessie hasn't aged.
- None shown on screen, but when One Piece creator Eiichiro Oda was asked about the possibility of the characters aging, he said that they do have birthdays, they just turn the same age every year ("Lucky bastards.") They all do end up aging after a two year time skip.
- The Movie for Yes! Pretty Cure 5 GO!GO! focuses on Nozomi's birthday, but she's never explicitly given an age (she started off Yes! Pretty Cure 5 as 14, but Comic-Book Time was invoked soon after).
- In a mild case of Dub-Induced Plot Hole in Sailor Moon S Usagi turns 15 in her birthday episode but the dub has this trope in place for Serena.
- Calvin and Hobbes had an arc were Susie invites Calvin to her birthday party. Her age isn't mentioned, but they all appear to be perpetually 6.
- The Duck Who Never Was plays with this. It was first published in 1994 (the sixtith anniversaty of Donald's debut), and yet Donald's age was never stated throughout the comic. One character does state Donald is sixty, but this character is near-sighted and has been reading Donald's filled-in form upside down. Speaking of the form, in the panel where we first see it, Donald wrote "Month: 09; Day: 06; Year: 19__", as he was in the middle of filling it out. In the panel where the employer misreads the form, we only see the day and the month, which are rendered as 90 and 60 respectively. Later, when the employer arrives at Donald's birthday party to give him his job back (still under the mistaken assumption over Donald's age), everyone at the party is shocked that Donald is sixty, but all Donald says is a sarcastic "Oh, sure! Hadn't you heard?" Gladstone Gander then exclaims, "Better stick some extra candles on the cake!" Of course, we've never seen the cake beforehand, and by the time we see it, the extra candles were already there.
- Averted in an issue of Immortal Iron Fist, where Danny Rand explicitly turns 33. The issue becomes, no Iron Fist has ever seen 34...
- Initially averted in Archie Comics' Sonic the Hedgehog when one issue has him celebrating his 15th birthday. When another issue has him celebrating a birthday, Rotor questions if he should be 16 or 17 (thanks to adventures in space, Mobius went through a year of changes while Sonic didn't age at all). Sonic replies he should be 16 forever and ever, thus invoking this trope should another birthday issue come up.
- Averted in Scott Pilgrim where Scott turns 24 at the beginning of Volume 4. Other characters' ages are noted, especially Knives Chau (17 Years Old), who turns 18 in the gap between Volumes 5 and 6.
- Spider-Man 2 has Peter's family throwing him a birthday party with no mention of his age. But since Aunt May referred to Uncle Ben's murder being two years ago we can infer that Peter turned 19 or 20.
- In Nintendo Adventure Books #5, Pipe Down, Princess Peach (who was named Princess Toadstool at the time) was celebrating her 99th birthday (in fungus years).
- There is a Just William story entitled William's Birthday. As William is always eleven and a half years old, it is not made clear whether this is his eleventh or twelfth birthday. He is eleven and a half in all the stories before and after this one.
- By contrast, while the fourth Jennings book, Jennings and Darbishire, features a birthday with no age mentioned, it is clearly Jennings' eleventh, because he was mentioned as "nearly eleven" in the previous book.
- In the Rainbow Magic series, books with birthdays in them never reveal how old the birthday person is.
Live Action TV
- Our Miss Brooks has the episode The Birthday Bag. Mr. Conklin asks Miss Brooks how old she is. Miss Brooks quickly dodges the question by starting a chorus of Happy Birthday.
- Family Matters had several episodes devoted to Carl's birthday with no mention of his age.
- Friends had several ageless birthday episodes for Rachel. Averted, though, in the episode where Rachel has her 30th.
- Saved by the Bell inexcusably did this with Screech's and Zack's birthdays. Since they're both in high school, there was no reason for them to not at least provide their new ages (which would've been anywhere from 15 to 18).
- Hey Dude!:
- The series did this in the "Guys vs. Girls" episode for Danny. Once again, inexcusable, since he was a "teenager" at the time.
- There was another episode that had an ageless birthday episode for Mr. Ernst.
- Several episodes of The Office have centered on birthdays for various cast members, including Meredith, Michael, and one where multiple birthdays are mashed together. Specific ages are never an issue, although this can be justified as the characters simply avoiding the subject on purpose.
- Thanks to the SORASing and de-SORASing frequently seen on soaps, this happens often.
- In Power Rangers whenever a Ranger celebrates a birthday no age will be mentioned. The most notable being the first time it happened in the first season in "Happy Birthday Zack" perhaps for the best since the characters originally meant to be high school juniors or seniors at the time where retconned into being freshman due to staying in high school for four seasons. Giving out an actual age would have ended in a continuity error.
- New Super Mario Bros. Wii begins with the Opening Narration, "Today is Princess Peach's birthday!" After the opening cutscene, birthdays become irrelevant for the rest of the game.
- Donkey Kong Country: Tropical Freeze starts with one for DK, before the bad guys crash the party.
- Sonic in Sonic Generations; it can be assumed that Sonic is still 15 years old.
- Averted in Tales of Symphonia. The game begins on Colette's birthday. Her new age is revealed to be sixteen years old.
- Lampshaded in Animal Crossing. When the villagers have their birthdays, they don't mention how old they're turning. But if you chat up a Snooty or Uchi villager enough, your character will actually ask them that (well, at least the way Heroic Mimes do), and they'll respond by saying it's rude to ask a lady her age.
- In Harvest Moon games birthdays will pass but no one ever ages, except occasionally for child characters and even then only on certain events.
- Barbie: Life in the Dreamhouse:
- The short "Gifts, Goofs, Galore" features Barbie and her friends celebrating her birthday. However, the friends realize that since Barbie never ages, as dolls never do, they don't know how old she is. Ken eventually asks her, but the vacuum drowns out her answer.
- "Little Bad Dress" takes place at Raquelle's half-birthday party, but the cartoon never specifies which half-birthday it is. (The cake only has four candles, but Raquelle looks older than four.)
- The same series averts this in "Happy Birthday Chelsea", in which Barbie's youngest sister, Chelsea, explicitly turns six years old.
- Achewood has celebrated Philippe's fifth birthday a few times, with the characters explicitly mentioning his age. Of course, what you have to understand is that when they say Philippe is five, they really do mean that Philippe is five.
- Played completely straight with the episode "Angelica's Birthday". To the extent that, in a later episode ("Pickles vs. Pickles"), her parents say that she's still 3 years old.
- Averted, though, in the aptly titled "Tommy's First Birthday".
- Played similarly straight in the Nickelodeon Doug episode "Doug's Birthday Present." To the extent that the Disney series opened with an episode about him turning 12. Since he was 11½ when he moved to Bluffington and lived there during the Nickelodeon birthday episode, the only logical conclusion one could draw is that he had two 12th birthdays! It's even stranger. The aforementioned "Doug's Birthday Present" is a Season 4 episode — the Season 2 episode "Doug vs. the Klotzoid Zombies" ends with Doug and his friends celebrating the 1st anniversary of him moving to Bluffington, and yet Season 3's "Doug's New Teacher" still says he's 11½!
- Hey Arnold!:
- In "Eugene's Birthday", Arnold tries to throw Eugene a surprise birthday party, (with unsuccessful results) but never mentions Eugene's new age.
- Same thing with Helga. In "April Fool's Day", Arnold gives her a gag present claiming it's a week-late birthday present, but never mentions how old she is now.
- Zig-Zagged during "Grandpa's Birthday". Phil turns 81, and it's a major part of the episode's plot, but after that episode his age is never brought up again.
- South Park:
- The episode "Damien" does this with Cartman's birthday (although we can probably assume that he turned 9 in this episode, as the show subtly suggests that he's a little older than the three other SP boys).
- Averted in "You're Getting Old", which opened with Stan celebrating his 10th birthday.
- The Flintstones had several such episodes for Fred (such as "The Swimming Pool"). Averted in the episode where Pebbles has her first birthday.
- Lampshaded in an episode of The Magic School Bus. It's Ms. Frizzle's birthday and the class goes to a bakery. During the And Knowing Is Half the Battle segment at the end, a kid goes there and tells the baker shown in the episode that one critical piece of information was missing from the show: They never said how old Ms. Frizzle is.
- Adventures from the Book of Virtues has one for Zach called "Gratitude". He's still 11 in this episode.
- Adventures of Sonic the Hedgehog:
- An episode had Sonic celebrate his birthday. Tails spends the entire episode trying to find a birthday present for him but Sonic's age is unmentioned.
- Sonic had ANOTHER birthday episode later on, as well, whereas Tails somehow remains 4 1/2 throughout the entire show, with no mention of his birthday at any point.
- The Simpsons:
- Lisa has had a number of these but remains 8. Averted in the episode where the mental patient who thinks he's Michael Jackson shows up, which is when she turns 8, the age she will remain for the rest of the series.
- Averted in the episode where Bart has his tenth birthday, and he's been ten ever since. Of course, this happened extremely early in the show's run, so it wasn't a problem back then.
- SpongeBob SquarePants:
- In the episode "SpongeBob Meets the Strangler", SpongeBob celebrates his birthday among several other parties he planned on the same day. Even though he has a revealed birthday, his age isn't revealed.
- Another epsiode ("Pet Sitter Pat") when Spongebob was invited to his grandmother's birthday. All was said about her age was "turning...even older".
- My Little Pony: Friendship Is Magic:
- The episode "Sweet and Elite" centers on Twilight Sparkle's birthday among other things, though her age is never revealed.
- Likewise, Pinkie Pie's age on her birthday is never revealed in "Party of One" and Spike's age is never revealed in "Secret of My Excess".
- Rainbow Dash's new age is also not revealed on her birthday in "Pinkie Pride".
- Sweetie Belle's fifth birthday was an important plot point in "For Whom The Sweetie Belle Toils", but it took place in the past.
- A "U.S. Acres" segment on Garfield and Friends had this for Roy.
- Dastardly and Muttley in Their Flying Machines has two. One involves Muttley's birthday, and in the other, Dick Dastardly thinks it's the general who is having a birthday.
- Yogi Bear had two such episodes: one for Ranger Smith and one for Yogi.
- The New Yogi Bear Show had another one for Yogi.
- Phineas and Ferb: the episode "Phineas' Birthday Clip-O-Rama" centers around Phineas' birthday, but his age remains a mystery (all we know is that despite aging a year he is still "younger than 15").
- In Teen Titans, the main arc of season 4 sets off with Raven's birthday. We're never actually told how old Raven is, but most of fandom assumes it was her 16th birthday because of the Dangerous Sixteenth Birthday trope.
- Subverted with Peppa Pig, where with the mom's birthday, Daddy Pig whispers it to Peppa, who comments that it's old. Daddy Pig just puts a couple of candles on the cake.
- Played with in Magic Adventures of Mumfie: Scarecrow celebrates his first birthday in "Scarecrow's Birthday Surprise" (Mumfie states this in a later episode), and The Queen of Night has an ageless one in "It Won't Be Alright On The Night".
- Time Squad:
- Otto has a birthday early on in the second season, but it's never established that he's eight years old until he mentions his age in a much later episode.
- Played totally forward with Larry 3000 when he wanted Tuddrussel to notice that it was his birthday, but it's kept pretty vague to how exactly old the robot is.