While it's not explicitly stated in the books, some maths nerds have worked backwards, citing evidence from The Order Of The Phoenix which reveals that Professor McGonagall started working at Hogwarts in December 1956, after working for the Ministry of Magic for two years after graduation. If McGonagall graduated in 1954, then she would've been born in 1935.
Which doesn't make much sense if she's meant to be a witch in her 20s or 30s in the upcoming Fantastic Beasts film. The long-awaited sequel to Fantastic Beasts and Where To Find Them will be released in cinemas worldwide on 16 November, but ahead of that the star-studded, magical cast will be celebrating the film's release at the World Premiere in Paris on Thursday.
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One said: "I know JKR is bad at math but this is ridiculous".
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Another said: "How is McGonagall going to be in the next fantastic beasts?". So, how can she be already teaching in Hogwarts eight years before she's even born? Johnny Depp will reprise his role as dark wizard Gellert Grindelwald, and several other characters from Potter lore - including Tina Goldstein (Katherine Waterston), Queenie Goldstein (Alison Sudol), Credence Barebone (Ezra Miller), Leta Lestrange (Zoë Kravitz), and Nagini (Claudia Kim) - also appear in the film.
Fantastic Beasts: The Crimes of Grindelwald is the second of five all-new adventures in J.K. Rowling's Wizarding World.
The second movie in the instalment is said to include lots of action in and around the United Kingdom - including scenes at Hogwarts. We'll have to wait and see.