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Social cycle theories are among the earliest social theories in sociology.Unlike the theory of social evolutionism, which views the evolution of society and human history as progressing in some new, unique direction(s), sociological cycle theory argues that events and stages of society and history generally repeat themselves in cycles.
Strauss and Howe define a social generation as the aggregate of all people born over a span of roughly 21 years or about the length of one phase of life: childhood, young adulthood, midlife, and old age. Generations are identified (from the first birthyear to last) by looking for cohort groups of this length that share three criteria.
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).
Pure sociology is a theoretical paradigm, developed by Donald Black, that explains variation in social life through social geometry, meaning through locations in social space. A recent extension of this idea is that fluctuations in social space—i.e., social time —are the cause of social conflict.
Mannheim defined a generation (note that some have suggested that the term cohort is more correct) to distinguish social generations from the kinship (family, blood-related generations) [2] as a group of individuals of similar ages whose members have experienced a noteworthy historical event within a set period of time.
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Women aged 65 are expected to live to 86.9 years, while men of the same age are likely to reach 84.3 years, according to the Social Security Administration's life expectancy calculator.
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.