When policymakers invoke the old-age dependency ratio as evidence of an impending catastrophe, they deploy a metric that the UN Office of the High Commissioner for Human Rights has characterised as fundamentally ageist—one that treats every person above an arbitrary threshold as a cost, regardless of their actual health, employment, or contributions. The true policy challenge is not that people are living longer, but that our measurement systems, budget structures, and institutional designs fail to recognise what healthy older adults do, fail to invest in sustaining their functional capacity, and fail to adapt labour markets and pension systems to the longevity gains we have achieved.
This inaugural essay for Second Dividend establishes a core analytical claim:
Population ageing becomes a crisis only when institutions refuse to evolve alongside demographic change.
The dependency ratio measures what no longer exists
The old-age dependency ratio—the number of people aged 65+ per 100 working-age adults—anchors nearly all fiscal projections for ageing societies. The OECD projects this ratio will rise from 33 today to 52 by 2050. Japan’s 51% ratio is projected to reach 81%. South Korea faces the steepest trajectory, moving from 28% to 79% within three decades. The OECD Employment Outlook 2025 notes that in the OECD area, the old-age dependency ratio increased from 19% in 1980 to 31% in 2023 and is projected to increase further to 52% by 2060. These figures dominate policy discourse, generating warnings of “demographic time bombs” and demands for immediate austerity.
Yet this metric embeds assumptions that no longer hold. It treats 65 as a biological threshold marking the onset of dependency, even though a 70-year-old in 2022 demonstrated cognitive health equivalent to that of a 53-year-old in 2000. It ignores that 27% of Americans aged 65-74 remain in the paid workforce, a rate that has increased from 22% two decades ago. It treats every person above the threshold identically, whether they are providing daily childcare to grandchildren, managing chronic illness, or running a business. The demographers Warren Sanderson and Sergei Scherbov have demonstrated that when population ageing is measured using “prospective age”—defined by remaining life expectancy rather than years already lived—the trajectories look dramatically different. Germany’s conventional dependency ratio rises continuously through 2050; its prospective measure peaks around 2040 and then declines.
The practical consequence of this mismeasurement is profound. When fiscal models treat everyone over 65 as a drain, they systematically understate the tax revenue that older workers continue to generate, the childcare that enables younger women to participate in labour markets, the volunteer hours that substitute for public services, and the consumer spending that drives economic growth. Adults over 50 already generate $45 trillion in global GDP annually—projected to reach $96 trillion by 2050—and control 70% of disposable income in high-income economies.
Healthy older adults are net contributors, not dependents
The empirical record on older adult contributions contradicts the burden framing at every turn. A World Economic Forum-commissioned study found that European adults over 60 contribute an average of €9,700 per person annually through formal and informal productive activities, totalling €1.1 trillion or 8% of regional GDP. The equivalent American figure is $20,511 per person. These contributions take forms that standard economic accounting systematically excludes.
Unpaid caregiving represents the largest invisible subsidy. AARP estimates that American family caregivers—predominantly older women caring for spouses, parents, or grandchildren—provide $600 billion in unpaid care annually, up from $470 billion just four years earlier. Grandparents specifically contribute $238 billion per year in childcare. When surveyed, 42% of working parents report relying on grandmothers for regular childcare; two-thirds of those parents state they would have lost their jobs without that support. This is not sentimental value—it is labour-market infrastructure.
Volunteering patterns show similar dynamics. Americans over 65 now account for 28.6% of all volunteer hours nationally, up from 18.5% two decades ago. While total volunteer hours among younger Americans fell by 55% between 2002 and 2021, volunteer hours among older adults declined by only 20%. The median older volunteer contributes 94 hours annually—nearly double the rate of prime working-age adults. New York State alone documents 495 million hours of community service annually from residents over 60, valued at $13.9 billion.
The differential contribution patterns between healthy and unhealthy older adults illuminate the policy stakes. Research consistently shows that older adults in good health retain human capital sufficient to contribute positively to economic growth. In contrast, poor health accelerates exit from productive activities and escalates care costs. A Japanese study found that functional limitations increase the probability of retirement by 3 percentage points and result in foregone wages of ¥32.3 billion, alongside additional care costs of ¥8.8 trillion. The policy implication is direct: the fiscal burden attributed to ageing is largely due to preventable illness.
Prevention spending is systematically undervalued by institutional design
If healthy ageing generates fiscal dividends, then investments in sustained functional capacity should command priority. Instead, prevention receives approximately 3% of total health expenditure across OECD countries—a proportion that has remained essentially flat for decades despite mounting evidence of its returns. The UK’s public health grant to local authorities has been cut by 26% in real terms per person since 2015. American public health spending has declined as a share of total health expenditure since 2000.
This underinvestment reflects structural failures, not analytical oversight. The “wrong pocket” problem identified in the health economics literature means that prevention investments made by one entity—a public health department or local authority—generate savings that accrue to different entities: insurers, employers, hospital systems, and future governments. Budget silos prevent the cross-sector coordination that prevention requires. A comprehensive review in Expert Review of Pharmacoeconomics and Outcomes Research concluded that this disconnect “creates a disincentive to invest in preventive strategies” despite their demonstrated returns.
Those returns are substantial. The Office of Health Economics in London calculates a median return on investment for primary prevention of 14:1, with prevention proving 3-4 times more cost-effective than treatment. A California study found that every dollar invested in public health yields up to $88 in improved health status and societal benefits. But these aggregate figures obscure critical variation in what actually works. A 2024 Office of Health Economics study found that adult immunisation programmes can deliver returns up to 19 times their initial investment when the full spectrum of benefits is valued—among the highest-return interventions in all of medicine. Conversely, landmark behaviour change trials like the Multiple Risk Factor Intervention Trial achieved minimal differences between intervention and control groups despite years of intensive counselling on diet, smoking, and exercise. The policy challenge is not simply to spend more on prevention, but to distinguish rigorously between interventions with demonstrated returns and those that merely carry the prevention label. A landmark simulation by Goldman and colleagues at USC, Harvard, and Columbia estimated that interventions to delay the biological processes of ageing would generate $7.1 trillion in social benefits over 50 years—dwarfing returns from disease-specific approaches that face diminishing marginal returns from competing causes of morbidity.
Equally important is how health spending is classified in national accounts. The System of National Accounts treats health expenditure primarily as final consumption—akin to eating food or watching entertainment—rather than as investment in human capital formation. Only physical infrastructure, like hospital buildings, counts as capital. This classification creates a conceptual barrier: governments are institutionally unable to frame health spending as a productive investment that generates future returns. The same fiscal authorities who would enthusiastically fund infrastructure bonds treat health spending as a cost to be minimised.
Treatment expenditure retains substantial value, particularly given that adults over 50 control 70% of disposable income in high-income economies. Sustaining the functional capacity of this economically powerful demographic through medical intervention preserves their consumption, investment, and productive contribution. A National Bureau of Economic Research study found that the value of medical treatment benefits for Americans over 65 increased by $113,000 per capita between 1999 and 2012, substantially outweighing the $58,000 increase in lifetime costs. Analysis of 38 OECD countries confirms that health expenditures should not be viewed merely as achieving health outcomes, but as a critical form of human capital investment that stimulates economic development. The policy failure is not spending on treatment, but the systematic underinvestment in prevention that could delay or reduce the need for treatment while extending healthy, productive years.
Labour market institutions amplify or mitigate the ageing challenge
Countries that treat older workers as assets have redesigned their institutions accordingly. Japan’s Act on Stabilization of Employment of Elderly Persons now requires employers to offer continued employment until age 65 and encourages employers to extend employment to 70. Sweden operates without a fixed statutory retirement age; its pension system, reformed in 1999, is actuarially neutral. Working longer directly increases pension income with no upper age limit for accruing rights. The United Kingdom abolished mandatory retirement in 2011. These countries recognise that the fiscal challenge of ageing is partly an artefact of policies that force capable workers out of the labour force.
Conversely, pension designs in many countries actively discourage continued work. Belgium, Greece, Luxembourg, and Türkiye offer no bonus for deferring pension benefits. Spain’s effective tax rates on continued work for older unemployed workers can exceed 100%. China maintains retirement ages of 50-55 for women and 60 for men—thresholds set when life expectancy was decades shorter—forcing healthy workers into dependency status by administrative fiat. These are not passive responses to demographic change; they are choices that manufacture the dependency they purport to manage.
The evidence on older worker productivity challenges stereotypes that justify these policies. The OECD Employment Outlook 2025 finds that firms experience positive productivity effects from a more balanced age structure. Cross-generational teams outperform age-homogeneous ones when older workers’ judgment combines with younger workers’ technical fluency. The knowledge transfer value of experienced workers—subject-matter expertise, business relationships, institutional memory—represents a capital asset that disappears when mandatory retirement severs it.
Better metrics reveal different policy imperatives
The gap between life expectancy and healthy life expectancy—currently 9.6 years globally—represents the compression of morbidity that prevention policy should aim to achieve. A 60-year-old in OECD countries can expect to live 23 more years, with 17.3 years in full health. This healthy lifespan has increased by 1.7 years since 2000, with 70% of longevity gains being healthy years. The Chicago Heart Association’s 40-year follow-up study found that favourable cardiovascular health at younger ages extended survival by nearly 4 years, postponed the onset of morbidity by 4.5 years, compressed total morbidity into a shorter period, and translated directly into lower cumulative healthcare costs.
These findings suggest a fundamentally different policy frame. The question is not how to pay for a fixed period of late-life dependency, but how to extend the period of healthy contribution and compress the period of intensive care need. The fiscal arithmetic of this reframing is consequential: the IMF calculates that healthy ageing policies could contribute 0.4 percentage points annually to global GDP growth through 2050, while labour supply policies could add another 0.6 points—together offsetting nearly three-quarters of the demographic drag that conventional projections assume.
Measurement reform should accompany policy reform. Prospective age metrics, health-adjusted dependency ratios, and economic dependency ratios that account for actual labour force participation would all provide more accurate guidance than the crude chronological threshold currently dominating policy. Time-use surveys that value unpaid care work—presently estimated at 9-40% of GDP, depending on methodology—would reveal the extent to which older adults’ contributions subsidise both families and public budgets. The UN has adopted Sanderson and Scherbov’s prospective ageing framework; national statistical offices should follow.
The framing choice determines the policy response
Population ageing is neither a crisis nor a blessing—it is a structural shift that demands institutional adaptation. The IMF’s June 2025 Finance & Development issue marks an instructive pivot in mainstream framing, noting that “older populations need not lead to slumping economic growth and mounting fiscal pressures” and characterising ageing workers as “an incredibly rich resource, given their valuable skill sets, experience, and commitment.” This language stands in stark contrast to decades of policy documents invoking “burdens,” “strains,” and “demographic drags.”
The evidence assembled here supports a specific claim: the fiscal challenge attributed to demographic ageing is substantially a product of institutional choices—measurement conventions that treat all older adults as dependents, budget structures that prevent cross-sector investment, labour market rules that force healthy workers into retirement, and political cycles that systematically favour visible treatment over invisible prevention. Countries that have reformed these institutions show different trajectories than countries that have not.
For policymakers, the implications are direct. Fiscal sustainability analysis should incorporate prospective ageing metrics and health-adjusted measures rather than crude chronological thresholds. Prevention investments should be evaluated over time horizons that match the benefits’ horizons, using discount rates appropriate to public goods rather than private returns. Labour market reforms should remove barriers to continued participation and ensure pension designs reward rather than penalise extended working lives. National accounts should develop satellite measures that capture the economic value of unpaid care and volunteering.
Second Dividend takes its name from the analytical premise that healthy longevity generates returns—to individuals, families, and public budgets—that current institutional arrangements fail to capture. The first dividend of demographic transition was a growing workforce and falling dependency ratios. The second dividend requires recognising that longer lives, structured by appropriate policy, extend productive contribution rather than merely extending dependency. Capturing that dividend demands analytical honesty about what ageing populations do, institutional reform that aligns incentives with contribution, and measurement systems that count what matters. The demographic transition is complete. The institutional transition has barely begun.
