Adolescence and Adulthood
- Adolescence is a transitional stage of physical and psychological human development that generally occurs during the period from puberty to legal adulthood (age of majority).
- A primary sex characteristic is any anatomical part of the body involved in sexual reproduction and constituting the reproductive system in a complex organism, especially the external sex organs.
- A secondary sex characteristic is a feature that appears during puberty, a phenotypic trait that distinguishes the two sexes, but unlike the sex organs, is not directly part of the reproductive system.
- Menarche is the first menstrual cycle, or first menstrual bleeding, in female humans.
- Spermarche refers to the beginning of development of sperm in boys' testicles at puberty.
- Identity formation is the development of the distinct personality of an individual.
- Erik Erikson was a twentieth century developmental psychologist known for his theory on psychosocial development of human beings. He may be most famous for coining the phrase identity crisis.
- In psychology, the term identity crisis, as coined by Erik Erikson, means the failure to achieve ego identity during adolescence.
- Erikson's stages of psychosocial development is a psychoanalytic theory which identifies eight stages of development through which a healthily developing human should pass from infancy to late adulthood.
- Menopause is the time in most women's lives when menstrual periods stop permanently, and the woman is no longer able to have children.
A beard is a human male secondary sexual characteristic.