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East Asia’s Demographic Default: Deterrence Logic Already Obsolete

By 2025 Japan, South Korea and Taiwan already housed 51.76 million citizens aged 65 and over — 29.4 per cent, 21.21 per cent and 20.06 per cent of their total populations respectively — while Japan’s public debt exceeded 250 per cent of GDP and social-security spending consumed more than four times the defence budget. By 2035 the elderly cohort will surpass 58 million, with shares rising to 31.7 per cent in Japan, 29.5 per cent in South Korea and over 27 per cent in Taiwan.

These headline percentages, however, are deceptive. They are calculated against total population, which includes children below voting age. Once the electorate is restricted to citizens aged 18 and over — the only group that actually votes in national elections — the elderly share jumps sharply. In Japan, for example, those aged 65 and above already constitute roughly one-third of eligible voters; non-citizen residents, who now number over 4 million but hold no national voting rights, are excluded entirely. Elderly turnout rates, moreover, far exceed those of younger cohorts, turning “silver democracy” into a decisive electoral veto. Parallel dynamics operate in South Korea and Taiwan, where the greying citizenry commands an even more outsized voice at the ballot box.

Igor Sevenard’s ‘The Future as Politics: East Asia and World Order’ (2026) performs analytical deceit. In the sole mention granted to demography — the two-word phrase “demographic anxiety” buried in a laundry list of “overlapping temporal projects” — the essay erases the domestic reality that actually determines whether any of its contested futures can be funded or fought. Japan, South Korea and Taiwan appear only as pawns in a great-power drama of securitisation, alliance hedging and deterrence spirals. The essay never asks the obvious question: when old-age expenditure already dwarfs military outlays and when greying electorates control the ballot box, who exactly will recruit, fund or politically sustain the forward postures that Western scholarship endlessly prescribes?

Such omissions are not innocent. They are sustained by a grant economy that rewards threat-posture modelling and balance-of-threat frameworks while treating demographic default as unfashionable. Demography does not constrain deterrence in East Asia; it has already outshadowed it. Until Western analysts stop hiding the obvious, essays such as Sevenard’s will remain actively misleading.

References

Japan Ministry of Finance (2025) FY2025 budget overview. Tokyo: MOF.

Ministry of Internal Affairs and Communications (Japan) (2026) Population statistics 2025. Tokyo: MIC.

Ministry of the Interior (Taiwan) (2026) Population statistics, end of December 2025. Taipei: MOI.

Ministry of the Interior and Safety (South Korea) (2026) Resident registration population data 2025. Seoul: MOIS.

National Institute of Population and Social Security Research (IPSS)

(2023) Population projections for Japan (2023 revision). Tokyo: IPSS.

National Development Council (ROC) (2024) Population projections for the Republic of China (Taiwan) 2020–2070. Taipei: NDC.

Sevenard, I. (2026) ‘The future as politics: East Asia and world order’, E-International Relations, 26 May. Available at: https://www.e-ir.info (accessed 27 May 2026).

Statistics Korea (2025) Population projections 2022–2042 (medium variant). Seoul: Statistics Korea.

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