It's hard to say whether a gifted 14-year-old is "too old" for this book or not - it's right on the borderline. (It would go back to being just fine for a 25-year-old, BTW - but for that difficult "prickly" age, I'm not sure.) I think it's probably more valuable for an 8-to-12-year-old. That said, it's not like there's a ton of books out there to choose from. Indigo's suggestion to use the Look Inside feature on Amazon is a good one. You could also check it out from the library and look at it yourself first.