Adolescence is the time when a person transitions from childhood to adulthood. Key Points Adolescence is a period of rapid physical, mental, social, emotional, and sexual growth and development. The characteristics of an adolescent are the following: ​An individual's physical, psychological, and sociological characteristics, as well as values, attitudes, interests, and behavior, change. The life cycle has both regularity and inconsistency. Adolescence is a complex and often difficult period in development for both adolescents and their families, due to rapid physical, psychological, and cognitive changes. The adolescent has a problem with the quick and rapid change of physical and psychological elements throughout this stage. Adolescents are engaged in solving problems on their own and attempting to acquire independence from their parents. Developing cooperative and workable relationships with peers and preparing for a meaningful job. ​​Thus, the characteristics of adolescents are increasing independence from adult control, rapid physiological changes, and increased focus on activities with peer groups.