There's no proof of that. Life expectancy has been increasing over time, especially in the past century or so. I don't think it's credible to suggest that civ

There's no proof of that. Life expectancy has been increasing over time, especially in the past century or so. I don't think it's credible to suggest that civilizations have progressed meaningfully slower now that people live to be 80 or so instead of only 30, which was common in recent history. And even if immortality "stalls" humanity, so what? People matter, not technology or some amorphous concept of "progress".