The demographic dividend is the economic growth that can result from a shift in a population's age structure. It occurs when the share of working-age people (15–64) rises relative to dependents (children and the elderly), creating a window where more people produce than consume.

This window opens when fertility falls. As families have fewer children, the share of working-age adults rises. East Asia captured this dividend from 1965 to 1990, and it accounted for roughly one-third of the region's extraordinary economic growth during that period.

The dividend is not automatic. It requires the right policies: investment in education so young workers are productive, job creation so they are employed, and savings mechanisms so the surplus is invested rather than consumed. Countries that fail on these fronts — creating large numbers of unemployed young people — risk instability instead of growth.

India is in the middle of its dividend right now. Its working-age population will not peak until around 2035, giving it a decade or more of demographic advantage. But with youth unemployment above 20%, the question is whether India can create enough jobs to capture the opportunity.

The dividend is temporary. As the large working-age cohort ages, the dependency ratio rises again — this time with elderly dependents rather than children. Countries that saved and invested during the dividend can support their aging population; those that did not face fiscal strain. The lesson: the dividend is a window, not a permanent state.