"The statistics are not good enough to say that based on the data we have, we can not live much longer," said report author Siegfried Hekimi, chairman of developmental biology at McGill. "It's just not good enough to say so."
To further investigate this, Wachter and his colleagues tracked the deaths of nearly 4,000 Italians, who were 105 years old between 2009 and 2015.
Investigators found that the chances of survival are inexorably diminishing when a person enters middle and old age.
For example, Italian women who turned 90 years old had a 15 percent probability within one year and an expected six-year life span. The results showed
But if they made it to 95, their chances of dying within a year increased to 24 percent and their life expectancy dropped to 3.7 years.
One might think that these opportunities would increase indefinitely as humans age to an undefined vanishing point.
That did not happen. The chances of survival rose instead, after people had crossed the limit of 1
"The risk of death is very high at 105, but next year it will not be higher," Hekimi said of the new study. "Every year you have the same chance of dying, and every year you can be the one who wins the toss."
This plateau is likely to occur because of evolutionary selection and the influence of good genes and healthy life choices, Wachter
said, "If you look at a group of older people who are all the same age, some are quite fragile and some are There is a big difference in frailty, "said Wachter
" People who go to college, 50th reunion, you just look around, and some people climb mountains while some people walk with sticks until 20 years later, the people who were already weak are those who probably died, "he said.
Not enough study participants
So far, looking at the genetics of long-lived humans has provided little evidence for the extension of the human lifespan, Hekimi said.