I'm not sure if I didn't read the synopsis clearly, but I found this reading's audience to be for those in their high school years. I guess being 28 years old isn't viewed as "young" anymore :)
Overall, I think that the content was worthwhile for its intended audience. For me, it seemed a little too entry level but did have some areas that I found beneficial to me.
Warning: the author attempts to throw in bits of humor and you will almost be able to see the rolling eyes of the teenagers to which he is talking to. Everyone knows that teenagers don't appreciate corny adult humor!