Adolescent age: Adolescence is a period of significant

Adolescence is a period of significant development that begins with the onset of puberty1 and ends in the mid-20s. Consider how different a person is at the age of 12 from the person he or she is at age 24. The trajectory between those two ages involves a profound amount of change in all domains of development—biological, cognitive, psychosocial, and emotional. Personal relationships and settings also change during this period, as peers and romantic partners become more central and as the ... Adolescence is a critical period of human development spanning from ages 10 to 19, as defined by the World Health Organization. During this transformative decade, young people experience profound physical, psychological, cognitive, and social changes that bridge childhood and adulthood. Rather than a single uniform stage, adolescence unfolds through three distinct yet overlapping phases—early, middle, and late—each characterized by unique developmental milestones and challenges ... Learn about the physical, cognitive, emotional and social changes that occur during adolescence, the period of transition between childhood and adulthood. Find out how to support your child's identity development, self-esteem and brain maturation. They usually start a year or two earlier in girls than boys, and it can be normal for some changes to start as early as age 8 for females and age 9 for males. Many girls may start their period at around age 12, on average 2-3 years after the onset of breast development.