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early adolescence is a time of dramatic physical changes due to puberty . pubertal changes also led to great interest in a person's body image . and changes in puberty leads to a strong interest in sexuality . although most adolescents experience positive sexual identity development , many of those who suffered sexual risk factors that can lead to negative developmental outcomes . adolescence is also a critical period in the development of health-related behaviors , such as good nutrition and regular exercise , which will improve health , and blaming telarang drugs , which would be detrimental to health . significant changes occur in the teenage brain ( amygdala and development of the early development of the front of the late cortex ) the effect on risk-taking and thrill of the search . teens thinking becomes more abstract , realistic, and logical . described by Piaget as a key aspect and formal operational thought . brain development and social context influence the process of decision-making in adolescents . 

opinion : if a 7 -year -old child was sitting in high school it is the cognitive development that goes with rapidly not like children in general , but in this case in accordance with the mental and emotional peers

Reference: Santrock,  J. W (2002). Life -Span Development, Perkembangan Masa Hidup". Jakarta: Erlangga