Originally published in 1901. PREFACE: No apology is needed for the issuing of this book. Men of Forty Five are generally as ignorant of the changes which attend those who enter upon that period, which has been aptly called "the youth of old age" as boys of fourteen are of the changes which attend the period of adolescence. Most men of forty have not so much as learned that the physical nature of the male undergoes any change at the period of middle life..........The information on 'What a man of Forty-five ought to know' makes for absorbing reading throughout. Many of the earliest books, particularly those dating back to the 1900's and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.