The answer is age and ethnic background of a population.
This option is incorrect because demographics typically refer to statistical data about the characteristics of a population, not its history.
This option is incorrect because while geography can influence demographics, it is not a demographic factor itself.
This option is partially correct, as gender is a demographic factor, but geography is not typically considered a demographic factor.
This option is correct because age and ethnic background are key demographic factors used to describe the characteristics of a population.
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