The psychology of maturity and the psychology of old age are two sections of the psychology of adulthood, which are the subject of a unique book by Professor E. P. Ilyin. The textbook covers a wide range of current issues, including the socio-psychological aspects of mature and old age, types of maturity and its impact on professionalism, “Balzac age”, existential acme, social functions of adults, aging as a process and its prevention, as well as many others . At the end of the manual you will find useful techniques and a detailed bibliography. The publication is intended for psychologists, doctors, teachers, sociologists, representatives of related specialties, as well as students of university faculties of relevant profiles.