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Why an Aging Workforce and Demographic Shifts Could Impact Stock Markets—and University of Missouri Employees' Retirement

'Understanding demographic trends, like the Middle-Old ratio, can offer invaluable insight for University of Missouri employees planning for retirement, as it highlights the potential for slower stock market growth in the future and suggests strategic adjustments to portfolios to align with shifting global economic conditions.' – Michael Corgiat, a representative of The Retirement Group, a division of Wealth Enhancement.

'By recognizing the impact of demographic shifts, such as the Middle-Old ratio, University of Missouri employees can better position their retirement portfolios to navigate upcoming market changes and demographic-driven economic shifts, helping their retirement planning to remain resilient in the face of long-term trends.' – Brent Wolf, a representative of The Retirement Group, a division of Wealth Enhancement.

In this article, we will discuss:

The impact of demographic shifts, particularly the Middle-Old ratio, on stock market trends and retirement planning.
How population changes influence market cycles and economic growth, with a focus on University of Missouri employees.
Strategies for adjusting retirement portfolios based on demographic forecasts, including exposure to emerging markets.

The long-term outlook for stock markets and retirement planning is being affected by the demographic changes happening in the United States and other industrialized nations. The 'Middle-Old ratio' (M/O ratio), which analyzes the ratio of middle-aged to elderly individuals, is a key factor that investors, particularly University of Missouri employees, should consider when planning for the future. For those preparing their retirement plans over the next decade or more, this ratio offers a unique approach to forecasting long-term stock market trends.

The Effect of the M/O Ratio on Stock Markets

The M/O ratio is determined by dividing the number of individuals aged 40 to 49 by the number of people aged 60 to 69. This metric has shown a strong correlation with long-term stock market cycles, especially in the S&P 500. Research conducted by Alejandra Grindal, chief economist at Ned Davis Research, has revealed that shifts in the M/O ratio often coincide with significant highs and lows in the stock market. ¹

For example, in 2000, when the internet bubble burst and the 1990s bull market reached its peak, the M/O ratio reached its highest point. This marked the end of an era of rapid economic growth and stock market gains. Following this peak, the ratio began to decline, mirroring the 2008 global financial crisis and the subsequent bear market. Since the middle of the 2010s, the M/O ratio has been rising, indicating that a shift may be on the horizon within the next decade.

It is essential to note that while the M/O ratio may act as an indicator for long-term market trends, it is not useful for forecasting short-term market movements. For instance, it did not signal the steep market declines in 2022. Nevertheless, it remains a valuable tool for understanding the cyclical nature of the stock market.

The Influence of Demographics on Stock Market Cycles

John Geanakoplos, a professor at Yale University, has made significant contributions to understanding the relationship between financial markets and demographics. His 2002 study highlighted that many of the boom-and-bust cycles in the stock market since World War II can be attributed to shifts in population composition, particularly the proportion of middle-aged versus elderly individuals. ² Geanakoplos explained that stock markets tend to rise when a significant portion of the population is in their prime working years and decline when a larger share of the population is elderly and no longer contributing to the economy.

This demographic shift is driven by the relative sizes of different age groups, not just the overall population. While some may focus on population growth when forecasting economic outcomes, it is the relative sizes of the middle-aged and senior cohorts that most significantly impact stock market performance.

It is expected that the M/O ratio will continue to rise into the 2030s. However, it will begin to decline again around the mid-2030s, which may signal a slowdown in stock market growth. This long-term pattern suggests that investors, particularly those at University of Missouri preparing for retirement, should be ready for potentially weaker equity returns starting in the early 2030s.

Taking Demographic Trends into Account When Managing Your Retirement Portfolio

Anyone preparing for retirement, especially University of Missouri employees with a long investment horizon, should understand how demographic shifts influence stock markets. This information can help you adjust your portfolio to align with anticipated market conditions, particularly if you are more than ten years away from retirement. As the M/O ratio seems to be peaking, it may be time to consider reducing exposure to U.S. stocks and reallocating to other regions, such as emerging markets.

For those nearing retirement, traditional strategies like those in target-date funds often recommend gradually decreasing equity exposure. For example, Vanguard’s target-date funds suggest a 30% allocation to U.S. stocks by the time an investor turns 65. However, due to demographic trends, a more cautious approach may be needed, especially for those in their 60s who wish to limit exposure to U.S. stocks.

Investors should also reevaluate the international component of their portfolios. While Vanguard's glide path recommends a 20% allocation to non-U.S. stocks, this may need to be adjusted based on the demographic outlook of specific countries. Over the next 25 years, developed nations outside the U.S. will also experience a decline in their M/O ratios, but not as sharply as in the U.S.

In the coming decades, emerging markets, particularly in Asia and Africa, are expected to see higher M/O ratios. As a greater portion of their populations enters middle age, these regions could experience economic expansion and market growth. To capitalize on these trends, it might make sense to increase your exposure to emerging markets, especially if you are nearing or already in retirement.

Conclusion: Preparing for Population Shifts and Stock Market Changes

Demographic trends, as illustrated by the M/O ratio, may influence stock markets and retirement planning. These trends indicate that starting in the early 2030s, investors, particularly those at University of Missouri with long-term horizons, may want to prepare for a period of potentially slower equity growth. As the middle-aged population reaches its peak, the stock market dynamics may shift, potentially leading to reduced returns in developed nations, including the United States.

To account for these anticipated demographic changes, it may be helpful to consider lowering your exposure to U.S. stocks and increasing your investment in emerging markets, where demographic trends appear more favorable. By adjusting your portfolio to reflect these long-term patterns, you can potentially position for a future with slower market growth and shifting global economic conditions. For a more sustainable retirement, begin planning now.

As the elderly population grows, the global workforce is shrinking, which could slow economic growth. A 2023 World Economic Forum report states that aging populations are contributing to a decline in the global workforce, potentially dampening economic productivity. This trend may lead to slower stock market returns and increased inflation, especially in developed countries where the aging population is advancing more rapidly.

Retirement planning must evolve as demographic changes and stock market patterns change. Understanding the M/O ratio and its implications could help you adjust your retirement portfolio, especially when considering opportunities in emerging markets. By aligning your investments with these demographic shifts, you can better prepare for a future where market growth may slow, supporting a more sustainable retirement.

Think of the stock market as a vehicle traveling along a winding road. For years, the car has been running smoothly, driven by a powerful engine (the large working-age population). But now, the engine is aging, and the fuel (economic growth and productivity) is running low. The aging population is like the car approaching a steep incline. Investors must adjust their speed, refuel with more strategic investments, and be ready for a slower journey into retirement.

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Sources:

1. Grindal, Alejandra. 'Why America's Aging Population Will Be a Problem for Stocks and Your Retirement.' Morningstar , 2 June 2025.

2. Geanakoplos, John, Michael Magill, and Martine Quinzii. 'Demography and the Long-Run Predictability of the Stock Market.' Brookings Institution , Jan. 2004, pp. 245–311.

3. Roberts, Stan. 'Why America's Aging Population Will Be a Problem for Stocks and Your Retirement.' MarketWatch , 2 June 2025.

4. VanEck Research Team. 'Emerging Markets: Policy Uncertainty Tempers a Strong Start to 2025.' VanEck , May 2025.

5. BlackRock. 'Five Forces Shaping Retirement.' BlackRock , Feb. 2025.

How does the eligibility criteria for the Defined Benefit Retirement Plan at the University of Missouri System differ for Level One and Level Two members, particularly in regard to their hire or rehire dates?

Eligibility Criteria for Level One and Level Two Members: Level One members are employees hired before October 1, 2012, or those rehired before October 1, 2019, who had earned a vested benefit but did not receive a lump sum. Level Two members are those hired or rehired between October 1, 2012, and October 1, 2019, without eligibility for Level One benefits. Employees hired after October 1, 2019, do not accrue service credit under the DB Plan(University of Missouri …).

In what ways do service credits accumulated at the University of Missouri System impact an employee's retirement benefits, and how can employees ensure that they effectively maximize their service credit over the years?

Impact of Service Credits on Retirement Benefits: Service credits are critical in calculating retirement benefits at the University of Missouri System. Employees accumulate service credits based on their years of service, which directly affect their pension calculations. Maximizing service credits involves consistent full-time employment without breaks, as any leave of absence or part-time status may impact the total service credits earned(University of Missouri …)(University of Missouri …).

What are the various options available to employees at the University of Missouri System for receiving their retirement benefits upon reaching normal retirement age, and how do these options influence long-term financial planning for retirement?

Retirement Benefit Options: Upon reaching normal retirement age, employees can choose between a Single Life Annuity or a Joint and Survivor Annuity, both with options for lump-sum payments of 10%, 20%, or 30% of the actuarial present value. These choices influence monthly payout amounts, and selecting a lump sum reduces future monthly benefits proportionally(University of Missouri …).

With respect to the University of Missouri System's Defined Benefit Plan, how are employees' contributions structured, and what implications does this have for their overall retirement savings strategy?

Employee Contributions: Employees contribute 1% of their salary up to $50,000 and 2% for earnings beyond that threshold. This structure helps fund the DB Plan, with the University covering the majority of the cost. Employees need to factor in these contributions as part of their overall retirement savings strategy(University of Missouri …).

How can employees at the University of Missouri System assess their eligibility for early retirement benefits, and what considerations should be taken into account when planning for an early retirement?

Early Retirement Eligibility: Employees may retire early if they meet specific criteria: at least 10 years of service credit for ages 55–60 or at least 5 years of service credit for ages 60–65. Early retirees will receive a reduced benefit to account for the longer payout period(University of Missouri …).

What tax implications should employees of the University of Missouri System be aware of when it comes to distributions from their retirement plans, and how can they effectively navigate these implications?

Tax Implications of Retirement Plan Distributions: Distributions from the University of Missouri System’s DB Plan are subject to federal taxes. Employees can mitigate tax burdens by electing to roll over lump-sum distributions to a qualified retirement account, such as an IRA, to avoid immediate tax liability(University of Missouri …).

What are the policies regarding the continuation of benefits for employees who leave the University of Missouri System, particularly for those who are not vested or are classified as non-vested members?

Non-Vested Employee Policies: Employees who leave the University before vesting in the DB Plan (fewer than 5 years of service) are not eligible for retirement benefits but can receive a refund of their contributions. These non-vested employees must decide whether to receive their refunded contributions as a lump sum or through a rollover to another retirement account(University of Missouri …).

How might changes in employment status, such as taking a leave of absence or returning to work after a break, affect the service credit calculation for an employee at the University of Missouri System?

Impact of Employment Status Changes on Service Credit: Employees who take leaves of absence or return after breaks in employment may experience reductions in service credit. However, certain types of leave, such as military service or medical leave, may allow employees to continue earning service credit(University of Missouri …)(University of Missouri …).

In the event of an employee's death prior to retirement, what benefits are available to their survivors under the University of Missouri System's Defined Benefit Plan, and how can members ensure their wishes are respected?

Survivor Benefits: In the event of an employee’s death before retirement, survivors may be eligible for either a lump sum or monthly payments. Employees can designate beneficiaries to ensure that their wishes are honored, providing financial protection for dependents(University of Missouri …).

How can an employee at the University of Missouri System contact the Human Resources Service Center to obtain personalized assistance regarding their retirement options and any inquiries related to their retirement plan details? These questions require detailed answers and are designed to facilitate a comprehensive understanding of retirement processes and options for employees of the University of Missouri System.

Contacting HR for Assistance: Employees can contact the Human Resources Service Center for personalized assistance regarding their retirement options by emailing hrservicecenter@umsystem.edu or visiting the myHR portal for further details(University of Missouri …).