This paper focuses on determining the evolution of thinking (converging and diverging) and determining the evolution of creative thinking throughout adolescence. 70 subjects have been tested, i.e. students of 8th, 10th and 12th grades, aged between 14 and 19. Creative attitudes of subjects have an in- depth development during transition from middle school to high-school. This transition also coincides with the bio psychophysiological development of the individual during the stages of his/her development: from preadolescence to adolescence, which confirms the development, diversification and enrichment of psychological acquisitions during the ontogenetic development of the individual.