Adolescence is the transitional period of physical and psychological development that occurs in humans between childhood and adulthood.
It typically begins around the age of 10 or 11, and ends around the age of 18 or 19.
During adolescence, individuals go through a number of physical changes as they progress from being children to adults, including the onset of puberty, the growth of secondary sexual characteristics, and the development of muscle mass and bone density.
In addition to physical changes, adolescents also experience a range of cognitive, emotional, and social changes, such as an increased ability to think abstractly, greater emotional intensity, and a greater desire for independence and autonomy.