The three stages of life are youth, middle age and retirees. A lot to live up to, but this book lives up to it. In the introduction, the author points out that there have been more books on yoga in the past twenty years that ever before, possibly since Vedic times. However, the author thought that he had something to add to the discussion, and after reading this book, I agree. I like the fact that he is quick to point out that this book should not be a substitute for a teacher, but for general information.
Chapter One gives a history of the author, which is very impressive.
I never got the feeling that he was trying to impress the reader with what he has done. Rather, it seems to be more of a tribute to the great teachers he has studied with. It is given in a matter of fact, humble tone. It left me with a feeling of confidence in what the author had to say. There are many stories and legends of Patanjali.