The sixth volume of the project “Development of the Child’s Personality” talks about current issues of adolescence. The personality of a teenager is a complex formation, where psychophysiological changes are closely intertwined with new possibilities in the cognitive and emotional sphere, where the diversity of feelings reflects the complexity of the inner world, and behavior - new ways of building relationships with oneself and others. Teenage hobbies, love, sexual behavior and feelings, relationships with peers and adults, deviations, professional self-determination, military service, the search for the meaning of life - the book contains systematic information about all aspects of this age period. The publication may be of interest both to parents and specialists, and to teenagers themselves.