As cohorts age,they replace one another in society's age structure.What do Riley,Johnson,and Foner (1972)call this?

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Riley, Johnson, and Foner (1972) refer to the replacement of one cohort by another in society's age structure as "cohort flow." This refers to the process by which individuals move through the stages of the life course and are replaced by younger cohorts over time. The other options (trans-societal aging, age stratification system, generation reproduction) are related to the study of aging and the life course, but do not specifically refer to this process of cohort replacement.

As Cohorts Age,they Replace One Another in Society's Age Structure