Аннотация:Self-determination in the value system is the key developmental task in adolescence.The aim of our research was to study the cohort differences and stability in the value sphere in adolescence. Methods: Sh. Schwartz's questionnaires -Portrait Values Questionnaire (PVQ) and Portrait Values Questionnaire-Revised (PVQ R), were used.The data consists of 3 cohort samples of adolescents: the first sample was gathered in 1997-1998, the second one –in 2003-2005; the third -in 2018. The gender composition included 52% of boys and 48% of girls. The complete data include 727 adolescents aged from 14 to 18; Results: benevolence, achievements, self-direction, and security values are consistently most important; power, tradition values are least important; and security, conformity, universalism and hedonism are in between.Values order for three sampleswas revealed by cohort comparative analysis. Conclusions: Significant differences in the hierarchy of values of the age cohorts of adolescents by cuts 1997–1998, 2003–2005 and 2018 were revealed. The importance of values of achievement, self-direction and security decreases and the importance of values of benevolence and hedonism increases.Gender differences indicate a tendency of increasing the value of hedonism among men and values of benevolence and security among girl