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Cognitive advances encompass both increment in knowledge and in the ability to think abstractly and to reason more effectively.The study of adolescent development often involves interdisciplinary collaborations.Pubescent boys often tend to have a good body image, are more confident, secure, and more independent.Late maturing boys can be less confident because of poor body image when comparing themselves to already developed friends and peers.Males experience their growth spurt about two years later, on average, than females.
Furthermore, even within a single nation state or culture there can be different ages at which an individual is considered mature enough for society to entrust them with certain privileges and responsibilities.
Physical growth (particularly in males), and cognitive development can extend into the early twenties.
Thus age provides only a rough marker of adolescence, and scholars have found it difficult to agree upon a precise definition of adolescence.
Consequently, girls that reach sexual maturation early are more likely than their peers to develop eating disorders (such as anorexia nervosa).
Nearly half of all American high school girls' diets are to lose weight.