Scientists say that humans have not reached the age limit and can live longer
An evolutionary anthropologist and his colleagues discussed this issue in an article published on the 15th issue of the Proceedings of the National Academy of Sciences. Improvements in various hygiene conditions, such as purifying drinking water, dietary patterns, and injecting antibiotics and vaccines, seem to have contributed greatly to extending life.
Ronald Lee, an economist specializing in population and ageing at the University of California, Berkeley, said: "This is shocking. We really thought that human beings may be the longest living creatures. The key problem is that we What is the age limit?"
Oskar Burger, an evolutionary anthropologist, and his research team hope to study the human lifespan in the context of human evolution. So they turned their research first to data collected about chimpanzees and the hunter-gatherer society in parts of Africa and South America, as well as data on Japan, Sweden, and France in the human mortality database.
These data show that since 1900, the possibility of death of Swedes and French people at a relatively young age is showing a steady decline. Compared with Western societies, the number of human deaths in hunter-gatherer societies is still close to the number of wild chimp deaths. However, researchers have found that mortality rates in the hunter-gatherer societies that received Western medicine and occasionally food aid have dropped significantly, opening the gap with chimpanzee death data, which is almost as close to death data in Sweden and France around 1900.
"The impact of pure drinking water and sufficient food on people's life is very significant," said Berg of the Max Planck Institute for Population Research in Rostock, Germany.
The study found that the death rate in the 30-year-old population of the hunter-gatherer community was equivalent to the current death rate at 72 years of age. People in the hunter-gathering society had a 1.3% chance of dying in their second year at the age of 15, and Swedes did not face such death rates until the age of 69.
In addition, the study found that there is still room for human life to extend, and the limit of life for healthy humans has not yet arrived. According to the theory of population aging, when people spend their reproductive period and breast-feeding period, their biological performance will gradually disintegrate. But for some reason, humans have so far seemed to have evaded this physiological risk.
Scientists recently conducted a series of studies in the laboratory using cell switches and genes to extend the lifespan of aphids and rodents. This study may be able to transplant to humans and help humans to further extend their lives. "Reducing mortality may not be as difficult as expected," said Brian Kennedy, a molecular biologist at the Institute for Aging Research in Novatobak, California. "I firmly believe that it is not impossible to control the longevity of healthy humans."
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