The study modelled life expectancy at birth against six drivers in 28 countries over 2003-2022. The abstract names income, health-system capacity, public health interventions, environmental quality and demographic change among them. A range of machine learning techniques allowed nonlinear associations; income showed a concave relationship with longevity. The preferred model projected life expectancy to 2032 under baseline, accelerated health-expenditure, and integrated health-system and prevention scenarios. Mean life expectancy was 78.10 years in 2022 and 78.21, 78.34 and 78.98 years in 2032 respectively. Gains concentrated where coverage gaps remained; the authors call these predictive scenarios, not causal counterfactuals, across 28 countries only.
Why it is interesting: It separates health-system capacity and prevention from income as predictors of national longevity. The spread across scenarios is under one year by 2032.
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