Has Human Life Expectancy Reached Its Limit?
2024-10-21
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1A new study says humanity is hitting the upper limit of life expectancy.
2Developments in medical technology and genetic research are not leading to major increases in lifespan overall, the researchers said.
3The study was published recently in Nature Aging.
4"We have to recognize there's a limit" and possibly change ideas about when people should retire and how much money they will need to live out their lives, said S. Jay Olshansky of the University of Illinois-Chicago. Olshansky was the lead writer of the study.
5Mark Hayward of the University of Texas was not involved in the study.
6However, he called it "a valuable addition to the mortality literature."
7"We are reaching a plateau" in life expectancy, he said.
8It is always possible that some new development could push survival to greater lengths, "but we don't have that now," Hayward said.
9Life expectancy is an estimate of the average number of years a baby born in a particular year might expect to live.
10The measurement assumes death rates at the time of birth do not change.
11Life expectancy is one of the world's most important health measures.
12Still the life expectancy measurement has problems.
13For example, life expectancy is an estimate that cannot include new developments or changes that might affect the length of people's lives.
14These unknown developments could include pandemics or new treatments for diseases.
15In the recent study, Olshansky and other researchers followed life expectancy estimates for the years 1990 to 2019.
16They took information from a database administered by the Max Planck Institute for Demographic Research.
17The researchers paid special attention to eight of the places in the world where people live the longest: Australia, France, Hong Kong, Italy, Japan, South Korea, Spain and Switzerland.
18The United States does not rank in the top 40, but it was included in the study because the researchers live in the U.S. Also, some experts have made estimates that life expectancy in the U.S. would increase greatly in the 2000s, Olshansky said.
19Women continue to live longer than men. Female life expectancy improvements are still happening - but at a slower rate, the researchers found.
20In 1990, the average amount of improvement was about 2.5 years every 10 years.
21In the 2010s, it was 1.5 years - but almost zero in the United States.
22Life expectancy measurements in the U.S. are more difficult.
23The country is affected by a number of causes of early death.
24Examples include drug overdoses, shootings, weight problems and uneven health care services.
25But in one calculation, the researchers estimated what would happen in all nine places if all deaths before age 50 were prevented.
26The increase at best was still only 1.5 years, Olshansky said.
27The study suggests that there is a limit to how long most people live, and we have almost hit it, Olshansky said.
28"We're squeezing less and less life out of these life-extending technologies.
29And the reason is, aging gets in the way," he said.
30It may seem common to hear of a person living to 100.
31Former U.S. President Jimmy Carter, for example, recently celebrated his 100th birthday.
32In 2019, a little over two percent of Americans made it to 100, compared to about five percent in Japan and nine percent in Hong Kong, Olshansky said.
33It is likely that the number of people who reach 100 will grow in the years ahead, experts say, but that is because of population growth.
34The percentage of people hitting 100 will remain limited, likely with fewer than 15 percent of women and 5 percent of men making it that long in most countries, Olshansky said.
35I'm Ashley Thompson.
1A new study says humanity is hitting the upper limit of life expectancy. 2Developments in medical technology and genetic research are not leading to major increases in lifespan overall, the researchers said. 3The study was published recently in Nature Aging. 4"We have to recognize there's a limit" and possibly change ideas about when people should retire and how much money they will need to live out their lives, said S. Jay Olshansky of the University of Illinois-Chicago. Olshansky was the lead writer of the study. 5Mark Hayward of the University of Texas was not involved in the study. However, he called it "a valuable addition to the mortality literature." 6"We are reaching a plateau" in life expectancy, he said. 7It is always possible that some new development could push survival to greater lengths, "but we don't have that now," Hayward said. 8What is life expectancy? 9Life expectancy is an estimate of the average number of years a baby born in a particular year might expect to live. The measurement assumes death rates at the time of birth do not change. 10Life expectancy is one of the world's most important health measures. Still the life expectancy measurement has problems. For example, life expectancy is an estimate that cannot include new developments or changes that might affect the length of people's lives. 11These unknown developments could include pandemics or new treatments for diseases. 12In the recent study, Olshansky and other researchers followed life expectancy estimates for the years 1990 to 2019. They took information from a database administered by the Max Planck Institute for Demographic Research. 13The researchers paid special attention to eight of the places in the world where people live the longest: Australia, France, Hong Kong, Italy, Japan, South Korea, Spain and Switzerland. 14The United States does not rank in the top 40, but it was included in the study because the researchers live in the U.S. Also, some experts have made estimates that life expectancy in the U.S. would increase greatly in the 2000s, Olshansky said. 15Who lives the longest? 16Women continue to live longer than men. Female life expectancy improvements are still happening - but at a slower rate, the researchers found. In 1990, the average amount of improvement was about 2.5 years every 10 years. In the 2010s, it was 1.5 years - but almost zero in the United States. 17Life expectancy measurements in the U.S. are more difficult. The country is affected by a number of causes of early death. Examples include drug overdoses, shootings, weight problems and uneven health care services. 18But in one calculation, the researchers estimated what would happen in all nine places if all deaths before age 50 were prevented. The increase at best was still only 1.5 years, Olshansky said. 19The study suggests that there is a limit to how long most people live, and we have almost hit it, Olshansky said. 20"We're squeezing less and less life out of these life-extending technologies. And the reason is, aging gets in the way," he said. 21It may seem common to hear of a person living to 100. Former U.S. President Jimmy Carter, for example, recently celebrated his 100th birthday. 22In 2019, a little over two percent of Americans made it to 100, compared to about five percent in Japan and nine percent in Hong Kong, Olshansky said. 23It is likely that the number of people who reach 100 will grow in the years ahead, experts say, but that is because of population growth. The percentage of people hitting 100 will remain limited, likely with fewer than 15 percent of women and 5 percent of men making it that long in most countries, Olshansky said. 24I'm Ashley Thompson. 25Mike Stobbe reported on this story for the Associated Press. John Russell adapted it for VOA Learning English. 26______________________________________________ 27Words in This Story 28mortality -- n. the death of large numbers of people 29literature -- n. the body of writings on a particular subject 30plateau -- n. a relatively stable level, period, or condition 31assume -- v. to take as granted or true 32extend -- v. to stretch out to fullest length