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.
Historical Biographies. Horatio Hollis Hunnewell (1810-1902) H. H. Hunnewell was a wealthy banker, railroad financier, philanthropist, amateur botanist, and one of the most prominent horticulturists in America in the nineteenth century. Practicing horticulture for nearly six decades on his estate in Wellesley, Massachusetts, Hunnewell made a donation in 1873 that helped Asa Gray revise and complete his Flora of North America.