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Adolescence is the transitional stage of development between childhood and full adulthood, representing the period of time during which a person is biologically adult but emotionally not at full maturity. The ages which are considered to be part of adolescence vary by culture, but in the United States, adolescence is generally considered to begin around age 13, and end around 24. "Adolescence" is a cultural and social phenomenon and therefore its endpoints are not easily defined tied to physical milestones. The word derives from the Latin verb adolescere meaning "to grow up." The time is identified with dramatic changes in the body, along with developments in a person's psychology and academic career. In the onset of adolescence, children usually complete elementary school and enter secondary education, such as middle school or high school.
During this period of life, most children go through the physical stages of puberty, which often begin before a person has reached the age of 13. Most cultures regard people as becoming adults at various ages of the teenage years. For example, Jewish tradition considers people to be adult members of the community at age 13, and this transition is celebrated in the bar (or bat) mitzvah ceremony. Usually, there is a formal age of majority when adolescents formally become adults. For example, Japan's celebration of this in January is called the coming of age (or 成人式) (see Japanese calendar).
In developed countries, the age at puberty has reduced in the last century, primarily because of better nutrition. That change is particularly apparent in the countries that adopted western food such as Japan. Girls tend to go through puberty earlier than boys.