I'm 35 years old and still found this book fun, interesting, engaging all the way through. There's some interesting strategy going on and the "cherubs" are human (not at all "perfect," which I liked because it made it easy to relate to them) and well-detailed. I started with this book because the first in the series wasn't available - and didn't feel I was missing out (there were a few references to earlier books but it didn't take away from this story), though I'll definitely go back and read the others in the series!