On the basis of age, the population of a nation is generally grouped into ______ broad categories.

Three

The correct answer is Option (3) → Three

On the basis of age, the population of a nation is generally grouped into three broad categories. These categories are:

• Children: Typically defined as individuals below 15 years old. They are generally not economically productive and require dependence on others for their needs.
• Working Age: This category encompasses individuals between 15-59 years old (ranges may vary slightly depending on the source). They are the economically productive segment of the population and contribute to the workforce.
• Senior Citizens: This category includes individuals above 59 years old (ranges may vary slightly depending on the source). They may or may not be economically productive, depending on retirement age and individual circumstances.