Some researchers say there is a natural limit and weve reached it. Others say it might be possible to extend longevity by focusing on bioresilience. Average life expectancy around the world has climbed steadily over the past 100 years. But longevity seems to have topped out at about 120 years.Whether there is an absolute limit to how long humans can live is a hotly disputed topic. Here are the facts: The all-time verified age record was set by Jeanne Calment of France, who died in 1997 at age 122. No one has come closer than age 119 since. Yet the ranks of people older than 110 continues to grow.To some researchers, this suggests theres a natural limit to how long humans can liveand weve pretty much reached it. Yes, average life expectancy has increased, thanks to things like clean water, improved living conditions and modern medicine. But these improvements can only do so much, and eventually the body wears out.Others say, in effect, that past performance doesnt guarantee future results. New and emerging medical technologies, they say, might be able to slow aging to such an extent that not only will we live much longer, but well stay biologically younger well into what used to be old age.

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