In the book "The Egypt Game" how old is April Hall?

April is 11 years old at the time of the novel's commencement.  It is at this age that she befriends the two other children, becomes immersed in the culture of Egypt, and enters into the "Egypt" world.  The entire scope of her experiences do not take her past 11.  The idea of the age's significance is representative of the adolescent emergence into adulthood, and the issues April confronts such as personal responsibility, identity formation, and understanding abstract social and individual perceptions of the good takes place at around ages 11-13. I believe that April's age is disclosed early on in the novel, so it can be easily rediscovered upon a secondary reading of the text.