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The Simpsons
In-universe, Bart Simpson and Harry Potter were the same age in 1990. Bart is perpetually 10 years old because of a spell put on his town by someone trying to keep him from getting his Hogwarts letter.
Title text: In-universe, Bart Simpson and Harry Potter were the same age in 1990. Bart is perpetually 10 years old because of a spell put on his town by someone trying to keep him from getting his Hogwarts letter.


The Simpsons is an American animated sitcom centered on the lives of the fictitious Simpson family. It is a very long-running series, having started with a Christmas episode in 1989, with the rest of the first season airing in 1990. As of the publication of this strip, it is still in production, having been on the air for 28 years with the same characters and primary cast. The decision was made early in the series that the characters wouldn't age, meaning that the parents, Homer and Marge, remained perpetually in their mid-thirties. The three children, Bart, Lisa, and Maggie, have remained 10, 8, and 1 year old, respectively. One of the interesting impacts of this dynamic is that the audience and the world have significantly aged over the course of the show, but the characters remain the same age. A rather dramatic example is that many of the early fans were similar in age to the children, but have now grown up, many have married and had children of their own, and they are now closer in age to the parents. This is a commentary on the longevity of the show.

The title text further relates this to the Harry Potter series, providing an explanation for why nobody has aged. Harry Potter is the protagonist in a series of young adult novels (later adapted into films) about the adventures of a boy wizard in his magical school, Hogwarts. The series begins when Harry is accepted to Hogwarts, at age 11, and the timeline implies that he was born in 1980. When "The Simpsons" began, Bart was 10, implying he was also born in 1980. Unlike Bart Simpson, Harry and his compatriots explicitly age over the course of the series. This strip ties the two series together, joking that the lack of aging in the Simpsons is a result of magic from the Harry Potter universe, intended to stop Bart from ever turning 11, for fear that he'd be accepted to Hogwarts.


Ambox notice.png This transcript is incomplete. Please help editing it! Thanks.
[A black frame containing a table of two columns and three rows, mostly in grey. The columns are titled 1990 and 2018, the rows are titled Lisa, Bart, and Homer & Marge. Lisa & Bart's ages now, as well as Homer & Marge's age in 1990, are in black, surrounded by a black jellybean-shaped loop visually grouping these three entries together.]
Fun Fact:
1990 2018
Lisa 8 36
Bart 10 38
Homer &
36-ish 64-ish
[Caption below:]
If you were Bart and Lisa's age during the first few seasons of The Simpsons, this year you're the same age as Homer and Marge.


This is another entry in xkcd's genre of comics that emphasize how surprising the passage of time can be.

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