I, too, am 32. Took the exam at 31, though. I don't necessarily agree with rg1 with regards to Chapman. I think you can almost pass the test exclusively with his book, Graffeo, NEC and NESC. Now, I wouldn't show up with only those materials, but it is easily passable with them alone. I do not own a copy of Wildi, but I have made a cursory scan of it. IMHO, it is more of an "academic" book, but Chapman is better suited for this type of scenario (Chapman was actually a college text of mine). This exam is not about "academics" per se, rather it is more about fundamentals and knowing how to work problems that take an average of 6 minutes to complete. The student in me loves academia, but the PE in me loves preparing to pass the test the first time around. By no means, I'm not telling you not to use Wildi, but don't get bogged down in the academics. Learn the approaches and techniques and move on.