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Erik Erikson and Carl Jung proposed stage theories [2] [3] of human development that encompass the entire life span, and emphasized the potential for positive change very late in life. The concept of adulthood has legal and socio-cultural definitions. The legal definition [4] of an adult is a person who is fully grown or developed.
Development before birth, or prenatal development (from Latin natalis 'relating to birth') is the process in which a zygote, and later an embryo, and then a fetus develops during gestation. Prenatal development starts with fertilization and the formation of the zygote , the first stage in embryonic development which continues in fetal ...
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 ...
Erikson's stages of psychosocial development, as articulated in the second half of the 20th century by Erik Erikson in collaboration with Joan Erikson, [1] is a comprehensive psychoanalytic theory that identifies a series of eight stages that a healthy developing individual should pass through from infancy to late adulthood.
The main crisis in the Late Adulthood Transition is a person fears that their inner youthfulness is disappearing, and only an old, fatigued, boring person will remain, leaving a person in this period with the task of keeping their youthfulness in a way that is suitable for late adulthood. [1] Levinson The Late Adulthood Transition is also said ...
Peer groups are especially important during adolescence, a period of development characterized by a dramatic increase in time spent with peers [155] and a decrease in adult supervision. [156] Adolescents also associate with friends of the opposite sex much more than in childhood [ 157 ] and tend to identify with larger groups of peers based on ...
Inspired by Theosophy, Rudolf Steiner (b.1861) had developed a stage theory based on seven-year life phases. Three childhood phases (conception to 21 years) are followed by three stages of development of the ego (21–42 years), concluding with three stages of spiritual development (42-63). The theory is applied in Waldorf education [15]
Age dynamics of the body mass (1, 2) and mass normalized to height (3, 4) of men (1, 3) and women (2, 4) [25] Comparison of a normal aged brain (left) and a brain affected by Alzheimer's disease. A number of characteristic ageing symptoms are experienced by a majority, or by a significant proportion of humans during their lifetimes.