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  2. Age stratification - Wikipedia

    en.wikipedia.org/wiki/Age_stratification

    In sociology, age stratification refers to the hierarchical ranking of people into age groups within a society. [1] Age stratification could also be defined as a system of inequalities linked to age. In Western societies, for example, both the old and the young are perceived and treated as relatively incompetent and excluded from much social life.

  3. Aging and society - Wikipedia

    en.wikipedia.org/wiki/Aging_and_society

    Even so, it has been estimated that population ageing only explains 0.2 percentage points of the annual growth rate in medical spending of 4.3 percent since 1970. In addition, certain reforms to the Medicare system in the United States decreased elderly spending on home health care by 12.5 percent per year between 1996 and 2000. [34]

  4. Social system - Wikipedia

    en.wikipedia.org/wiki/Social_system

    In sociology, a social system is the patterned network of relationships constituting a coherent whole that exist between individuals, groups, and institutions. [1] It is the formal structure of role and status that can form in a small, stable group. [ 1 ]

  5. Age grade - Wikipedia

    en.wikipedia.org/wiki/Age_grade

    In sociology and anthropology, an age grade or age class is a form of social organization based on age, within a series of such categories, through which individuals pass over the course of their lives. This is in contrast to an age set, to which individuals remain permanently attached as the set itself becomes progressively more senior.

  6. Social cycle theory - Wikipedia

    en.wikipedia.org/wiki/Social_cycle_theory

    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.

  7. Social class in American history - Wikipedia

    en.wikipedia.org/wiki/Social_class_in_American...

    The emergence of systematic social science, especially sociology, shifted the center of class studies into sociology departments. The most representative example was the Middletown books by Robert Lynd and Helen Lynd, which gave a microscopic look at class structures in a typical small city (Muncie, Indiana). After 1960 localized studies gave ...

  8. Ageing - Wikipedia

    en.wikipedia.org/wiki/Ageing

    Ageing (or aging in American English) is the process of becoming older until death.The term refers mainly to humans, many other animals, and fungi; whereas for example, bacteria, perennial plants and some simple animals are potentially biologically immortal.

  9. List of time periods - Wikipedia

    en.wikipedia.org/wiki/List_of_time_periods

    Ancient history – Aggregate of past events from the beginning of recorded human history and extending as far as the Early Middle Ages or the Postclassical Era. The span of recorded history is roughly five thousand years, beginning with the earliest linguistic records in the third millennium BC in Mesopotamia and Egypt .