The number of persons aged 65 or older,divided by the number of persons age 20-64,times 100 is known as the _____.

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The old-age dependency ratio (OADR) is a measure of how many people of retirement age (65 and over) depend on the working-age population (20-64). It is calculated by dividing the number of people aged 65+ by the number of people aged 20-64 and multiplying the result by 100. A high OADR indicates that there are fewer working people to support retirees, which can potentially impact a country's social security and economic systems.

The Number of Persons Aged 65 or Older,divided by the Number