"Adolescent"

 Adolescence is the transitional period from infancy to adulthood, in which a person experiences rapid physical growth, along with mental and social growth and development. During the early period of adolescence, the ability for abstract thinking, distinguished from concrete thinking, begins to increase gradually when solving problems or making decisions. In the middle stage of adolescence, the person reaches the peak of puberty, beginning to keep a distance from parents and trying to be independent in order to attain autonomy; friends play a central role in this process. Once the late period of adolescence is reached, abilities in abstract thinking develop fully, and as a result, the person thinks about his/her future roles and plans.