LONGEVITY: Humans Are Surprisingly Good at Predicting When They Will Die – With One Big Bias. “A study that tracked older adults in Japan for up to 28 years suggests people have a surprisingly accurate sense of their own longevity. Those who expected to live longer generally did. But their predictions showed one striking bias: many underestimated how much time they had left. Among participants whose outcomes could be determined, the researchers report that approximately 59 percent outlived their expected lifespan.”