Yes its a brilliant book for boys aged 8 to 80. Im 47 and I enjoyed it tremendously. When I was 10 I remember building a go-cart exactly like the one described. So for older boys it brings back great memories when you could play outside all day without the worry of modern problems.
Its packed with things that you learnt as a child and forgot (like cloud formations, making a paper boat, learning about insects and tress), or should have learnt as child (famous adventurers, famous battles).
There is also a great list of recommended books that "every boy should read". Many of them I have read and the ones that I havent, I am making sure that I do !
The fabulous hard cover means the book will last for years. Its a book that should have been passed down from generation to generation, and now it will be.