Also from
www.write4kids.com, in their 'Ask Questions Here!' section:
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From a post by 'Marcia' at
www.write4kids.com
Roughly, the age groups are: youngest, 3-7; mg (middle grade), 8-12; and teen or YA (young adult), 12+. These aren't absolutes, and there are subcategories. You may see picture books labeled for 4-8. Young readers run about 6-9, and these are usually written with vocab and sentence structure so the brand-new reader can tackle them. Chapter books, which are bridge books between early readers and novels, might be labeled 8-10. You may see mg's identified for 9-12, and some YA or early teen books for 10+ or 10-14.
From a post by 'Goldschmidt' at
www.write4kids.com (in same topic/thread as above)
Yup, age groups do vary, and Marcia's description of the younger reader, middle-grade, young adult categories is right on. Also consider length -- how long is your work? Publishers often have fairly strict rules for word count, especially for younger readers. Guidelines abound all over the Web -- here's a snippet and some links:
> Easy reading picture book: 32 pages
> Easy reader 48-64 pages
> Early chapter book 48-64 pages (depending on the publisher)
http://www.underdown.org/early_rd.htm
http://www.cbcbooks.org/readinglists/choosing.html
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Your description of target age range of 6 - 8+ kinda straddles the 'standard' definitions (but there is a wide variance in reading skills by age, plus the parent-reading-to-child factor, so ...). 9,500 words divided by (say) 150 words per page would be about 63 pages (less if the words-per-page is higher than 150, more if words-per-page is less than 150), so you may be at the high end of the 'easy reader' / 'early chapter book' lengths noted by 'Goldschmidt'.