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Theory of generations (or sociology of generations) is a theory posed by Karl Mannheim in his 1928 essay, "Das Problem der Generationen," and translated into English in 1952 as "The Problem of Generations." [1] This essay has been described as "the most systematic and fully developed" and even "the seminal theoretical treatment of generations ...
An average modern life is around 85 years and consists of four periods of ~21 years Childhood → Young adult → Midlife → Elderhood; A generation is an aggregate of people born every ~21 years Baby Boomers → Gen X → Millennials → Homelanders; Each generation experiences "four turnings" every ~85 years
It also is "the average period, generally considered to be about 20–30 years, during which children are born and grow up, become adults, and begin to have children." [2] In kinship, generation is a structural term, designating the parent–child relationship. In biology, generation also means biogenesis, reproduction, and procreation.
Glen Elder theorized the life course as based on five key principles: life-span development, human agency, historical time and geographic place, timing of decisions, and linked lives. As a concept, a life course is defined as "a sequence of socially defined events and roles that the individual enacts over time" (Giele and Elder 1998, p. 22).
In population biology and demography, generation time is the average time between two consecutive generations in the lineages of a population.In human populations, generation time typically has ranged from 20 to 30 years, with wide variation based on gender and society.
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As of 2017, many of these Baby Boomers had celebrated their 60th birthdays, and so, over the late 2010s and early 2020s, America's senior citizen population increased. The generation gap, however, between the Baby Boomers and earlier generations is growing due to the Boomers population post-war. [clarification needed]
Existential phenomenology encompasses a wide range of thinkers who take up the view that philosophy must begin from experience like phenomenology, but argues for the temporality of personal existence as the framework for analysis of the human condition.