Denominator age group for calculation of dependency ratio is
**Core Concept**
The dependency ratio is a demographic measure that indicates the number of individuals who are dependent on the working-age population for support. In this context, dependency ratio is calculated as the ratio of the number of dependents (children and elderly) to the number of working-age individuals.
**Why the Correct Answer is Right**
The correct denominator age group for calculation of dependency ratio is the working-age population, typically defined as individuals between 15 and 64 years of age. This age range is considered productive and capable of contributing to the economy, whereas children below 15 years and elderly above 64 years are considered dependent. The working-age population is used as the denominator because it represents the individuals who are capable of supporting the dependents.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a standard age range used for calculating the dependency ratio.
**Option B:** This option is also incorrect because it includes individuals below 15 years and above 64 years, who are considered dependents, not the working-age population.
**Option C:** This option is incorrect because it is not a standard age range used for calculating the dependency ratio.
**Clinical Pearl / High-Yield Fact**
A high dependency ratio can have significant economic implications for a country, as it may lead to increased financial burdens and reduced economic growth.
**Correct Answer: C. 15-64 years.**