Title in this Set :. The Defining Decade: Why Your Twenties Matter and How to Make the Most of Them Now by Meg Jay. Condition : BRAND NEW. Format    :  Paperback. ISBN        :  9781782114925. Description :. Contemporary culture tells us the twentysomething years don't matter. Clinical psychologist Dr Meg Jay argues that this could not be further from the truth. In fact, your twenties are the most defining decade of adulthood.The Defining Decade weaves the latest science of the twentysomething years with real-life stories to show us how work, relationships, personality, social networks, identity and even the brain can change more during this decade than at any other time in adulthood. Smart, compassionate and constructive, The Defining Decade is a practical guide to making the most of the years we cannot afford to miss.. About the Author :. Meg Jay, PhD, is a clinical psychologist and an associate professor of education at the University of Virginia. She earned a doctorate in clinical psychology, and in gender studies, from University of California, Berkeley. Her work has appeared in the New York Times, Los Angeles Times, USA Today, Psychology Today, and on NPR, the BBC and TED. Her books have been translated into more than a dozen languages.