This book combines social science research with biological science research stemming from rigorous scientific research investigations. It precisely tracks how gender communication differences change as one's biology and physiology changes, and how these changes occur throughout different stages of life. This text provides easy-to-understand scientific information for better understanding of oneself and others. It teaches one how to strategically communicate more effectively, and even to change biological physiology of oneself and others through simple-to-understand recommendations. This book can benefit all readers from teens to senior citizens in their personal lives, as well as advancing their careers through strategic communication. A reader can start reading any chapter and gain valuable insight. Overwhelming scientific research evidence proves, with absolute 100% certainty, that biological sex influences gender communication differences!