I think the best starting target age would be elementary school kids, but I think they could be younger and get the help of an adult/sibling to help them read and understand the book. The coach doesn't need to be familiar with programming because the book is written assuming the reader has no prior programming knowledge. Any C compiler can be used to compile and run the code on your computer. There are many free C compilers available online.
Every plan is a little cooler if you have a blimp. And a tiny ad.
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop