Pension Funds Face Aging Crisis With Rising Longevity and Low Birth Rates

The world's pension systems are facing a demographic challenge as longer lifespans and declining birth rates threaten their ability to provide sustained retirement payouts. Pension funds operate mainly under defined-benefit plans, promising fixed incomes, and defined-contribution plans, which depend on savings and returns. Longer retiree lifespans increase liabilities and pressure on investments, posing risks to pension sustainability.

The 2026 Marsh CFA Institute Global Pension Index report highlights that out of 55 pension systems surveyed, 43 have fertility rates below the replacement level of 2.1 children per woman, with 23 below 1.5. Life expectancy at age 65 in developed regions has increased by 50.9% since 1950, adding about 20 years of retirement coverage. The ratio of workers to retirees is falling, straining pay-as-you-go pension models that rely on current workers’ contributions.

This demographic shift is already visible in the US, where the Old-Age and Survivors Insurance Trust Fund is projected to deplete its reserves by late 2032. Experts warn of increasing costs and risks to pension funding, emphasizing that many pension systems are currently insecure. For ordinary investors, this means potential shifts in pension fund strategies, risks to future benefits, and increased focus on investment returns and funding health.