In a person’s life, several stages of psychological development succeed each other, the passage of each of which entails consequences that influence the future. Adolescence, as one of the subjects of study of developmental psychology, differs from other stages in less study and contradictions in the theoretical constructs of psychologists and teachers. This is probably due to the fact that both adolescence and youth are historically new stages of human development, which were formed under the influence of external social factors and have not yet become established in the structure of social relations. A similar hypothesis was expressed by D.B. Elkonin in his work “Modernity and Age.” Psychological studies of age conducted by different schools are based on different typologies of age stages. Despite the presence of discrepancies, all researchers have a significant similarity both in determining the periodization of human ages and in the qualitative description of the specifics of each age stage. In the scheme of age periodization of ontogenesis, adopted by specialists in the problems of age morphology, physiology and biochemistry, adolescence was defined as 17-21 years old - for boys and 16-20 years old - for girls. In Western countries, psychologists are inclined to combine adolescence and adolescence into one stage, defined as the period of growing up. The task of this stage is the transition from “childhood” to “adulthood”. Often, experts avoid identifying a clear age framework, stating that this period covers the age from 12 to 25 years. The parameters for determining biological age, both for adolescence and youth, depend, among other things, on the researcher’s view of the previous and subsequent periods of a person’s life Thus, according to S. Buhler, there are five stages of the human life cycle. The first stage begins at the moment of birth and ends at the age of 15 years. The main characteristic of this stage is the uncertainty of life goals. A person’s choice of any life plan implies the abandonment of an infinite number of other plans. Until this choice occurs, a person’s future seems to him to be vague and undivided. Therefore, at this stage, a person has the opportunity to live in the present, without thinking about the future and having the opportunity to focus on physical and mental development. The second stage includes the period from 15 to 20 years. This is the period when a young person (teenager or young man) becomes aware of his goals, values, interests and needs. This is a time for resolving comprehensive global issues - professional self-determination, attempts to find a husband or wife, choice of political, religious, philosophical and other views on life [Tolstykh, A.V. Experience of concrete historical psychology of personality / Introductory article by F.T. Mikhailov. - St. Petersburg: “Aletheia”, 2000]. A different classification of age periods is proposed by E. Erikson. He defines the period from 12 to 19 years as adolescence and youth, while the next stage, from 20 to 25 years, is called early adulthood in his studies. In his opinion, the main task of the teenage/adolescence stage is to acquire one’s own identity, i.e. such an image of oneself, which in the conditions of difficult choices (friends, spouses, social roles) would remain holistic and consistent. For E. Erikson, it is the identity crisis, which in a short period of time confronts a person with a number of social and individual choices, that is at the core of the understanding of adolescence. Therefore, it is youth, from his point of view, that is the most important stage in the psychological and social development of a person. In Russian developmental psychology, there is an established opinion that youth is a special, independent stage of human development. D. B. Elkonin speaks of adolescence as “senior adolescence "and defines its boundaries for the period from 15 to 17 years. This position is supported in his research by I.S.Kon. He calls the next stage.