Human Lifespan Limit

The article presents the central implication that human lifespan is approaching a true limit of about 125 years. Expected maximum lifespan increased in nearly all countries analyzed over more than a century. Future interventions targeting underlying aging processes are presented as the path toward expanding maximum lifespan. The article distinguishes maximum human lifespan from life expectancy because maximum lifespan concerns the extreme upper tail of survival. The article presents maximum human lifespan as a dynamic statistical quantity rather than a fixed constant. The national survival-curve analysis found that x0 increased over 200 years while delta stayed near 100 years. The article distinguishes average lifespan gains from changes to the biological limits of aging. The article argues that finite fitted upper bounds can be misleading if treated as natural constants because they move over time. The article argues that gains in life expectancy and observed maximum ages do not necessarily imply indefinite lifespan extension. Theoretical upper-bound lifespan is defined only when the GEV shape parameter is negative under the reversed Weibull case. The paper does not prove that no…