Adolescents is a period of transition from childhood to adulthood. Positive attitude is a state of mind that allows adolescent to envision and expect good things. A positive emotional disposition toward the subject, a positivity that accepts the world as it is. Objective: To demonstrate the effect of advancing age on positive attitude. Materials and methods: A cross sectional study was conducted in Mosul city, Iraq. Adolescents aged 11-19 years were the target population. The age was classified into three categories: early (11 - 13 years), middle (14 - 16 years), and late (17 - 19 years). Rates of positive attitude among adolescents were presented in a table. The association was tested by chi square test. Results: Adolescents positive attitude (emotions, family cooperation, and coping with social demands) were increasing with advancing age. Conclusions: Advancing age affect positively attitude of adolescents (emotions, family cooperation, and coping with social demands) except healthy lifestyle.