Age stratification

the unequal distribution of wealth, power and privileges among people at different stages in the life course
Found on http://wps.pearsoned.co.uk/wps/media/objects/2143/2195136/glossary/glossary

Age stratification

In critical sociology, age stratification refers to the hierarchical ranking of people into age groups within a society. Age stratification which is based on an ascribed status is a major source inequality, and thus may lead to ageism. ...
Found on http://en.wikipedia.org/wiki/Age_stratification
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