What is the difference between age strata, age groups, and cohorts? 

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Age Strata : consists of a classification of people into different age groups. Age strata or stratification is commonly used in census, policy formulation (for old-age care, juvenile care, etc.) It is useful in determining how a certain age strata can help the society or needs help...

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iamkaori | Student

An age strata (age stratification) is ranking people into hierarchy based on their age. This is also known as ageism.

Age groups are just groups that are created because of their age, and are not necessarily ranking or determining superiority like age strata.

A cohort is basically a group of people. An age group is a type of cohort.

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