methodology
This real-time model utilizes a Standard Sigmoid (Logistic) Curve to calculate population decline. Unlike linear models, this reflects the biological reality of aging where mortality rates accelerate during mid-life and taper during the centenarian phase.
This clock utilizes US Census Bureau data and actuarial curves to estimate population decline. It assumes a maximum lifespan of 115-120 years (Projected Extinction: 2079) with a generation-specific life expectancy benchmark adjusted for the 1946-1964 cohort.
P(deceased at time t) = 1 / (1 + exp(-k * (t - t_mid)))
k = 0.115, t_mid = 2030.0 (calibrated to 39.13% deceased on 2026-05-03)