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Populations across much of the developed world, and increasingly in middle-income countries, are aging rapidly as birth rates decline and life expectancy rises, creating a demographic shift with far-reaching economic and social consequences. One immediate concern is the sustainability of pension systems designed decades ago, when a larger working-age population supported a comparatively small retired cohort; as this ratio narrows, many governments face pressure to raise retirement ages, increase contribution rates, or transition toward funded rather than pay-as-you-go pension models. Healthcare systems confront a parallel strain, since older populations generally require more frequent and more costly medical care, particularly for chronic conditions such as diabetes and cardiovascular disease, prompting policymakers to invest in preventive care and community-based support that can delay costlier institutional treatment. Labor markets are also affected, as a shrinking working-age population can constrain economic growth unless offset by productivity gains, increased labor force participation among older adults, or immigration policies that admit younger workers. Some countries have responded by encouraging phased retirement, in which older employees gradually reduce working hours rather than exiting the workforce abruptly, preserving institutional knowledge while easing the transition to retirement. Family structures shift as well, with a growing number of households facing the dual burden of caring for aging parents while raising children, a pattern demographers term the sandwich generation. Long-term planning increasingly recognizes that no single policy lever, whether pension reform, healthcare investment, or immigration, can fully offset population aging on its own, and that coordinated strategies across multiple sectors are needed to maintain economic stability and social cohesion as this demographic transition continues.