Adolescence is a stage of development which starts with puberty (8 to 12 years) and ends around the age of 20 to 24. This period varies depending on when the person is mature enough physiologically or neurologically. In this stage there are extreme changes in developmental domains including biological, psychosocial, emotional and cognitive changes. Noticeable changes occur in body image, sexual characteristics, ability to think abstractly, evaluate reality hypothetically and decision making. Adolescence is often divided into 3 different stages: early adolescence, middle adolescence and late adolescence.