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The formal study of adolescent psychology began with the publication of G. Stanley Hall's Adolescence in 1904. Hall, who was the first president of the American Psychological Association, defined adolescence to be the period of life from ages 14 to 24, and viewed it primarily as a time of internal turmoil and upheaval (sturm und drang). [90]
Five Tanner stages of male genitalia; The Adolescent Period. In males, testicular enlargement is the first physical manifestation of puberty (and is termed gonadarche). [30] Testes in prepubertal males change little in size from about 1 year of age to the onset of puberty, averaging about 2–3 cm in length and about 1.5–2 cm in width.
The Tanner scale (also known as the Tanner stages or sexual maturity rating (SMR)) is a scale of physical development as pre-pubescent children transition into adolescence, and then adulthood. The scale defines physical measurements of development based on external primary and secondary sex characteristics, such as the size of the breasts ...
t. e. Preadolescence is a stage of human development following middle childhood and preceding adolescence. [ 1 ] It commonly ends with the beginning of puberty. [ 2 ] Preadolescence is commonly defined as ages 9–12 [ 3 ] ending with the major onset of puberty. It may also be defined as simply the 2-year period before the major onset of ...
A child using fingers to make a small, circular hole in the sand, 1997. Child development involves the biological, psychological and emotional changes that occur in human beings between birth and the conclusion of adolescence. It is—particularly from birth to five years— a foundation for a prosperous and sustainable society.
The World Health Organization defines adolescence as the period between the ages of 10 and 19 years. [5] Pregnancy can occur with sexual intercourse after the start of ovulation, which can happen before the first menstrual period (menarche). [6] In healthy, well-nourished girls, the first period usually takes place between the ages of 12 and 13 ...
Adolescent health. Adolescent health, or youth health, is the range of approaches to preventing, detecting or treating young people's health and well-being. [1] The term adolescent and young people are often used interchangeably, as are the terms Adolescent Health [2] and Youth Health. Young people's health is often complex and requires a ...
Menstruation. Diagram illustrating how the uterus lining builds up and breaks down during the menstrual cycle. Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The menstrual cycle is characterized by the rise and fall ...