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Have we already reached the maximum life span for a human being? Maybe not, said a study of Italian centenarians published this week that found that human longevity is slowly increasing.
Scientists have long debated whether the ultimate lifespan of people has been reached. A 2016 study in the journal Nature argued that "in 1997, when the French Jeanne Calmant died at the record age of 122.
But the new discoveries in the Journal Science emphasize the possibility of prolonged human longevity, and that the lifespan of our species may increase over time.
According to data from over 3,800 centenarians in Italy, researchers found that the risk of death was slowing down. 105.
"As we age, our health and our risk of death worsens faster and faster, but at extreme ages they continue to worsen," said co-author Kenneth Wachter , professor of statistics at the University of California at Berkeley.
"They are not doing better, but they continue to worsen.The researchers studied data on all the inhabitants of Italy aged 105 and over between 2009 and 2015 – those born between 1896 and 1910, for a total of 3,836 documented cases, stated
With a focus on mortality among people born in the same years, there was a slight decrease in mortality
suggesting that people were living a little longer than in previous years
"The slow but distinct improvements over time that we observe at the plateau level beyond age of 105 years give hope that a fixed limit of life is not currently in sight, "says Wachter.
Socio-economic factors and medical care improvements could be factors in lengthening human lifespan. [1965] 9003] But age-like plateau models at extreme age are observed in other species, suggesting common structural and evolutionary explanations. If the research is confirmed by other studies, it could mean that the limit of human life has not yet been reached.
Life expectancy on a global scale has increased almost continuously since the 19th century, but babies born in the United States today, for example, can expect to live nearly 79 years of age against 47 for Americans born in 1900.
But people who live to old age are rare
Since Calmant's death, the general trend for the oldest person in the world has been d & # 39; Reach around 115 years old.
Wachter stated that the results do not point to a new potential life limit. "Our results say nothing about ages beyond 113," he said. "But they provide a little hope that a better understanding of the interactions between genetic variants and medical and behavioral factors can help improve the health and survival of people aged 80 to 90, in 10 or 15 years old. "
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