Imagine blowing out 500 candles on your birthday cake. You’ve lived through five distinct centuries, watched civilizations rise and fall, mastered dozens of careers, and seen technology evolve beyond your wildest childhood dreams. While half a millennium of life sounds like the plot of a sci-fi novel, breakthroughs in longevity science, cellular reprogramming, and anti-aging biotech are pushing researchers to ask a fascinating question: What would human society actually look like if we...