The problem of the current research is summarized in the following questions: What is the level of developmental changes in adolescents?Keywords: developmental changes, the physical aspect, the cognitive aspect, the psychological aspect, the adolescent stage, emotional sensitivity.As well as identifying the level of emotional sensitivity in adolescents, identifying the relationship between developmental changes and emotional sensitivity, and identifying the nature of the differences between developmental changes and emotional sensitivity according to some demographic variables (sex - age).There are statistically significant differences between males and females in favor of females in emotional sensitivity.There are also statistically significant differences between males and females in favor of females in developmental changes.There are statistically significant differences between the two age groups in favor of the age group (14) in emotional sensitivity.There are statistically significant differences between the two age groups (14-17) in favor of the age group (17) in developmental changes.Does the degree of developmental changes and emotional sensitivity in adolescents differ according to gender and age?