The novice book is used in the White Tower to officially enroll those who wish to attempt to become Aes Sedai. Once enrolled in the novice book, a novice may not forsake Tower training until she is put out by the Tower or until she attains the rank of Aes Sedai. Though an instrument of administration, nevertheless it is held in great esteem by Aes Sedai.
An age restriction was once in place for those who wished to be written into the novice book, as it was believed that any girl over the age of eighteen was too old to adapt to the discipline. But when Egwene al'Vere became Amyrlin Seat of the rebel Aes Sedai, she removed this restriction and opened the novice book to women of all ages. As Amyrlin of the reunified White Tower, Egwene has continued allowing older women to enroll, and currently the number of novices sits at close to one thousand. This is a number which many believe will continue to increase, providing the novice book remains open to all. The oldest novice in the White Tower is 67 years old. The ability to Travel also increases the possibility of finding more women to enroll.