Going off of information from the books and Pottermore, which is an online Mecca for all things Harry Potter, people have been quick to point this out.
Incidentally, Pottermore features original writing from creator J.K. Rowling which is generally recognised as official canon. That aside, in the original series Professor McGonagall first started teaching at Hogwarts in 1985, when she was 21 years old.
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People have tried to argue that this Minerva is actually Professor McGonagal's mother, but this is entirely wrong because they had different names. Minerva's mother is supposedly a woman named Isobel who never taught at Hogwarts.
Others see her appearance in the film as just an error, but a popular belief is that it's part of some big plan which will be revealed at a later date.
@blizzardnsummer @JoelleMonique @MattGoldberg @ajhan 1956 Dumbledore telling young McGonagall: "I need you to go ba… https://t.co/ejfJkHQUJw