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This is called the secular trend. [38] [39] Fewer than 10% of U.S. girls start to menstruate before 11 years of age, and 90% of all U.S. girls are menstruating by 13.8 years of age, with a median age of 12.4 years. This age at menarche is not much different (0.3 years earlier) than that reported for U.S. girls in 1973.
Puberty is the process of physical changes through which a child's body matures into an adult body capable of sexual reproduction.It is initiated by hormonal signals from the brain to the gonads: the ovaries in a female, the testicles in a male.
Particularly in Western societies, modern legal conventions stipulate points around the end of adolescence and the beginning of early adulthood (most commonly 16 though ranging from 14 to 21) when adolescents are generally no longer considered minors and are granted the full rights and responsibilities of an adult.
Secular variation is sometimes called secular trend or secular drift when the emphasis is on a linear long-term trend. The term is used wherever time series are applicable in history , economics , operations research , biological anthropology , and astronomy (particularly celestial mechanics ) such as VSOP (planets) .
Adolescence is a time of rapid cognitive development. [60] Piaget describes adolescence as the stage of life in which the individual's thoughts start taking more of an abstract form and the egocentric thoughts decrease, allowing the individual to think and reason in a wider perspective. [61]
The age of thelarche has been decreasing in the past few decades. Between 1973 and 2013, the age of thelarche decreased at a rate of 0.24 years per decade. [9] Other contemporary trends that may be contributing to this change in the onset of thelarche include increasing BMI, changes in pubertal timing, and environmental exposures.
In 1961, 19-year-old Robert Allen Zimmerman dropped out of college in his native Minnesota, made a pilgrimage to New York City to meet his folk music idol Woody Guthrie, and decided to become, in ...
Adolescence is the period of life between the onset of puberty and the full commitment to an adult social role, such as worker, parent, and/or citizen. It is the period known for the formation of personal and social identity (see Erik Erikson ) and the discovery of moral purpose (see William Damon ).