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.
Fenwick /fen-wick/ [2 sylls.] as a boys' name is of Old English origin, and the meaning of Fenwick is village on the marsh.Kreatif forms: Fanwick, Faynwick, Finwick.enwick is an uncommonly occurring first name for men but a very prominent surname for all people (#6904 out of 150436, Top 5%). (2000 U.S. Census).