↑Harry Potter and the Prisoner of Azkaban, Chapter 18 (Moony, Wormtail, Padfoot and Prongs) - "It took them the best part of three years to figure out how to [become animagi]... Finally, in our fifth year, they managed it."
↑In Harry Potter and the Half-Blood Prince, Chapter 4 (Horace Slughorn), Slughorn says Cresswell was "in the year after" Lily Evans at Hogwarts School. Seeing that Lily's (born in 1960) first year was the 1971-1972 school year, Dirk's had to be the 1972-1973 school year and, thus, he was born in late 1960 or early 1961.
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