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Population aging, driven by declining fertility rates and increasing life expectancy, is reshaping the fiscal and social structures of industrialized nations at a pace that has surprised even demographers who anticipated the trend decades in advance. Pension systems designed in the mid-twentieth century, when a much larger working-age population supported a comparatively small number of retirees, are now under strain in countries where the ratio of workers to retirees has fallen sharply, prompting a wave of policy responses ranging from raising retirement ages to encouraging higher birth rates through financial incentives. Evidence on the effectiveness of these responses remains mixed. Countries that raised the statutory retirement age report improved short-term fiscal balances but also warn of unintended consequences, including higher unemployment among older workers who are pushed out of jobs before qualifying for benefits, and increased strain on disability insurance programs as an alternative pathway to income support. Pro-natalist financial incentives, meanwhile, have shown only modest and often temporary effects on fertility rates, with several nations reporting an initial uptick in births followed by a return to previous trends within a few years, suggesting that deeper economic and cultural factors, such as housing costs, career pressures, and childcare availability, exert more durable influence on family size than direct cash incentives. A smaller number of countries have pursued a third strategy, expanding immigration to supplement the working-age population, a politically contentious approach that has nonetheless shown more consistent demographic impact than either retirement age reform or fertility incentives. Policy analysts increasingly argue that no single lever is sufficient and that durable solutions will likely require combining several imperfect strategies simultaneously.