William
William asked Stuart Gibbs:

You’ve said that you have no plans to make stories aimed for adults. Forgive my lack of knowledge on how the age rating system works. But will you ever consider bumping it up for Spy School, considering how Ben is now a few years above that group, keeping all the conversations natural. My friend and I both reading the books when we were 8. And after so many years we’re wondering if the dialogue will evolve as well?

Stuart Gibbs As Ben gets older, then yes, his dialogue will evolve a bit -- but he is not aging very quickly in the books. I will end the series long before he becomes an adult.

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