- Demographic dividend refers to the accelerated economic growth that can be experienced when a country's working-age population grows relatively faster than its non-working-age population. - The working-age population is typically defined as individuals between the ages of 15 and 64. - However, in the context of specific countries like India, or for statistical purposes, slightly different ranges are sometimes used, such as 15-59 or 15-60, considering factors like retirement age. - Option D (15-59 years) represents a commonly accepted range for the working-age population used in analyses of demographic dividend, particularly in the Indian context, making it the most accurate option among the choices.