Fortunately you can easily change it. If you go to https://appleid.apple.com and login using their account details, in the Password and Security section, you can change the year of their birth. 1/1/2001 works fine, I think the key is that they need to be over 13 to change from Adult to Child account.
Benjy Fenwick (d. 1981) was a wizard and member of the original Order of the Phoenix. He fought in the First Wizarding War and was murdered and mutilated by Death Eaters before the war's end.
The Dark Lord. You have no idea the weapons he possesses! Peter Pettigrew, better known as Wormtail, is a major antagonist in the Harry Potter franchise and serves as the hidden main antagonist of Harry Potter and the Prisoner of Azkaban and the tertiary antagonist in Harry Potter and the Goblet of Fire.