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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
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.
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.
Sociology as a scholarly discipline emerged, primarily out of Enlightenment thought, as a positivist science of society shortly after the French Revolution.Its genesis owed to various key movements in the philosophy of science and the philosophy of knowledge, arising in reaction to such issues as modernity, capitalism, urbanization, rationalization, secularization, colonization and imperialism.
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 time has passed, history and sociology have developed into two different specific academic disciplines. Historical data was used and is used today in mainly these three ways: examining a theory through a parallel investigation, applying and contrasting events or policies (such as Verstehen), and considering the causalities from a macro point of view.