Why Men Seldom Succeed Before 40

I discovered, from the analysis of over 25,000 people, that men who succeed in an outstanding way, seldom do so before the age of 40, and more often they do not strike their real pace until they are well beyond the age of 50. This fact wast so astounding that it prompted me to go into the study of its cause most carefully, carrying the investigation over a period of more than 12 years.