The book is not only a systematization of accumulated knowledge about adulthood and various aspects of growing up, this publication can serve as an internal interlocutor for readers who are concerned about issues of self-development, growing up, and maturity. What does it mean to be an adult? Are adulthood and maturity the same thing? Is it possible not to grow up? How to understand what is most important in life? Is everyone facing a midlife crisis? What makes a person change his well-established and organized life and explore new spaces and professions? Is there a limit to growing up? The answers can be very diverse, and the author, based on client stories, gives the reader the opportunity to reflect on his life, think and talk about himself. The book is addressed to a wide range of readers, in addition, it can be a good help for professional consultants and psychotherapists working with existential problems adults.