Elderly Dependency Ratio: This term refers to the proportion of elderly people (usually over 65 years old) in a population compared to the working-age population. It measures how many older individuals depend on those who are still working.
Developing Countries: These are nations that have lower average incomes, less industrialization, and higher rates of poverty compared to more developed countries.
Dependency Burden: This term refers to the total proportion of both young and elderly people in a population who depend on those who are economically active. It takes into account both youth and elderly dependency ratios.