U.S. Census Bureau projects 65+ share of global population doubling to 19.6 percent by 2060

The documented shift stems from sustained fertility declines below replacement levels combined with gains in life expectancy. Primary data from the Census International Database and OECD health accounts show government health spending in member states already expanding at roughly twice the rate of revenues. This fiscal trajectory directly constrains defense budgets and infrastructure investment in high-income economies. Japan’s 29.7 percent elderly share in 2025 and South Korea’s projected lead illustrate how rapid aging alters labor supply and tax bases. European states face parallel pressure, with the 65+ cohort reaching 30.8 percent by 2060, while Africa’s absolute numbers of older adults will surpass Europe’s despite younger median age. States respond by adjusting pension replacement rates and immigration rules to preserve workforce size. Real policy adjustments already visible include expanded retirement ages in Germany and Japan plus selective skilled-migration programs in Canada and Australia. These measures trade short-term fiscal relief for long-term dependency on foreign labor inflows. The primary record shows no coordinated multilateral response; each government calibrates its own incentives around domestic solvency and electoral constraints. OECD pension models indicate that without further reforms, public expenditure on retirement benefits will claim an additional 2–4 percentage points of GDP in G7 economies by 2040. This trajectory forces states to weigh trade-offs between domestic entitlement stability and external power projection.