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1st book: 13

2nd book:14

3rd book: 15

4th book:16

5th book: 17

you know i keep loling at these answers i fix, the first book is 8th grade... how old are most 8th graders? the last book will be 12 grade, how old are most 12th graders.... the first person to anser this hasn't read the 5th book because it doesn't come out till September 2010

1st book: 13 (8th grade)

2nd book:14 (9th grade)

3rd book: 15 (10th grade)

4th book: 16 (11th grade)

5th book: 17 (12th grade) that's what i would say as most kids in those grades are of those ages.

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13y ago

What else can I help you with?