Since 1900, average life expectancy around the globe has more than doubled, thanks to better public health, sanitation and food supplies. But a new study of long-lived Italians indicates that we have yet to reach the upper bound of human longevity.
"If there's a fixed biological limit, we are not close to it," said Ms Elisabetta Barbi, a demographer at the University of Rome. Ms Barbi and her colleagues have published their research in the journal Science.
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