Population Aging & Intergenerational Welfare

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Abstractions about demographic transition, longevity, frailty, reproduction, life quality, retirement security, and fairness between generations.

10 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Demographic window — The period when a population’s working-age share is unusually high relative to dependent young and older groups, creating potential for a demographic dividend.
• Elder Index — A county-level benchmark estimating the income older U.S. adults need to meet basic housing, food, health-care, transportation and household expenses without assistance.
• Estimated date of delivery — Estimate a pregnancy's delivery date by anchoring gestational age to the best available menstrual, conception, or ultrasound evidence and retaining the estimate unless a documented redating threshold is crossed.
• Frailty index — A deficit-accumulation measure of biological vulnerability equal to the proportion of a selected set of age-related health deficits present in an individual.
• Gross reproduction rate — Summarize a period's age-specific fertility and sex ratio as the expected number of daughters in a synthetic female cohort that experiences those rates and no mortality through the reproductive ages.
• Intergenerational equity — A justice principle requiring benefits, burdens, opportunities and inherited resources to be assessed fairly across present and future generations.
• Life expectancy — The expected number of remaining years of life at a specified age under a cohort’s realized mortality or a period life table’s age-specific mortality rates.
• Life Quality Index — A calibrated welfare index combining life expectancy with purchasing-power-adjusted income under a time-allocation elasticity parameter.
• Old-age-security hypothesis — A demographic-economic hypothesis that parents demand more children where adult offspring are expected to provide income, care and protection in old age, with pensions reducing that motive.
• Postmaterialism — Model a cohort-level shift in value priority from economic and physical security toward autonomy, self-expression, participation, equality, and quality-of-life goals under sustained formative security.