I'm glad Ceili revived this thread; I'd not have seen it otherwise. I voted 5th or 6th grade since I interpreted the question to mean what age a child should be given a reader of their very own. I queued up a Bobbsey Twins book for the 8-year-old daughter of a friend. She enjoyed reading it in the car as we were driving to her grandmother's house.
Definitely the younger the kids are, the larger the font needs to be. Take a look at books aimed at the beginning readers. The larger fonts are sometimes a problem for the older kids who are not reading at their age/grade level. They feel like they are being given "baby" books. So teachers working with these kids have to work to find books with content that is high-interest, age-appropriate, and with a more limited vocabulary. You want to get them so engaged in the story that they forget they are "reading".
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