Global Pension Crisis: An Ageing Population’s Threat to Retirement Security

The world's pension systems are teetering on the edge of a demographic crisis, grappling with the dual pressures of increasing lifespans and plummeting birth rates. This imbalance threatens to stretch retirement finances to their breaking point, casting a shadow over the ability of these funds to sustain payouts for future generations.

Pension plans typically fall into two main categories: defined-benefit plans, which guarantee retirees a fixed income, and defined-contribution plans, where payouts are contingent on accumulated savings and investment performance.

• For defined-benefit schemes, the primary challenge is mounting liabilities as beneficiaries live longer.
• Defined-contribution members face the risk of outliving their savings, intensifying pressure on investment returns.
• This crisis is exacerbated as the pool of active workers contributing to these systems continues to shrink.

Sebastien Betermier, executive director at the International Centre for Pension Management, aptly described the situation as a "ticking time bomb." He highlighted that some pension funds now support individuals retired for nearly half a century, with members reaching ages like 107 or 108. "The higher the longevity, the more years the pension funds have to cover, and so that immediately comes in as an additional liability," Betermier explained, noting the significant cost burden placed on future generations.

The stark reality of this challenge is underscored in the 2026 Marsh CFA Institute Global Pension Index (MCGPI) report. The index revealed that 43 of the 55 covered pension systems have fertility rates below the replacement level of 2.1 children per woman, with 23 even falling below 1.5. Simultaneously, life expectancy at age 65 in more developed regions has surged by 50.9% since 1950, adding approximately 20 more years to retirement periods. This means benefits must last considerably longer, even as the ratio of potential workers to retirees is projected to decline sharply.

Pension funds’ continued exposure and plans to increase allocations come at a time when parts of the private credit market, particularly software-heavy lending, are facing heightened scrutiny. Christopher Furlong | Getty Images News | Getty Images

“The funding of future pensions and aged care both become more critical as the ratio of workers to retirees continues to decline,” the MCGPI report stated, warning that “Very few systems, as they currently operate, are secure.”

Pay-as-you-go pension systems, which rely on current worker contributions to fund present retirees, are particularly vulnerable to a shrinking workforce. In the U.S., the Old-Age and Survivors Insurance Trust Fund, which provides retirement and survivor benefits, is projected to deplete its reserves by the fourth quarter of 2032, according to its latest trustees' report.

“Everybody is shifting a little more risk where they can. The costs are going up with this demographic shift.”

Jean-Pierre Aubry, Center for Retirement Research at Boston College

Even fully funded pension schemes, which invest contributions for future benefits, are not immune. As members retire and begin drawing benefits, some funds may find outflows exceeding new contributions, necessitating a reevaluation of their investment strategies and liquidity needs, as highlighted by the MCGPI report: “Future benefit outflows will exceed the level of contributions or premiums ... this financial strain will inevitably grow in the future.”

Rethinking Risk in Pension Investments

The demographic crunch is fundamentally reshaping how pension funds approach investments. Many mature funds are already paying out more in benefits than they receive in contributions, forcing them to increasingly rely on investment returns and accumulated assets. For instance, in Australia, roughly a third of superannuation funds reported negative natural cash flows from assets over a three-year period, indicating benefit payments surpassed contributions.

Industry observers note that this pressure to generate higher returns has propelled some funds towards riskier and more complex investments, including private equity, infrastructure, and private credit. "You can try to earn higher returns on your investments, but that's going to require taking on greater levels of risk," Betermier observed.

Jean-Pierre Aubry, associate director of state and local research at the Center for Retirement Research at Boston College, confirmed that pension funds are progressively embracing riskier portfolios, though the degree varies. "I think everybody is shifting a little more risk where they can. The costs are going up with this demographic shift," Aubry stated. He pointed out that U.S. state and local government pension funds allocate only about 20% of their assets to bonds, with the majority invested in equities and private assets, making them significantly more exposed to investment risk compared to their European and Canadian counterparts.

However, not all pension managers view ageing demographics as an imperative for higher-risk bets. David Elias, CEO of Australian pension fund Hostplus, emphasized that demographic shifts are merely one of many factors influencing investment decisions. He stressed the importance of maintaining a diversified portfolio across asset classes, geographies, and industries, ensuring that potential returns adequately compensate for associated risks. Elias also suggested that governments possess the capacity to mitigate the pressures of ageing populations through measures like immigration policies and technological advancements, noting that such shifts could also unlock new investment opportunities. "I don't underestimate governments being incredibly creative in terms of dealing with these types of issues," he remarked. "You know, but they're going to have to address it, no doubt about that."