Just how old is Professor McGonagall? Has she worked at Hogwarts for thirty-nine years1 or for closer to a century? 2
Mrs. J. K. Rowling. Harry Potter and the Order of the Phoenix location 4720. © 2003↩︎
Mrs. J. K. Rowling. Fantastic Beasts: The Crimes of Grindelwald Page 137. Text copyright © 2018 Published by Arthur A. Levine Books, an imprint of Scholastic Inc.↩︎