Life expectancy in 2040 will rise at least a little in all countries, but the rankings will change dramatically, with Spain taking the top position, while China and the United States are trading
With a projected average With a lifetime Almost 85.8 years ago, Spain – formerly in fourth place – will dethrone Japan, which today holds the top position with 83.7 years and will fall back to second place in 2040. Singapore will stay in third place with increasing life expectancy from 83.3 to 85.4 years
Hong Kong, which has the world's highest average life expectancy according to Japan's Ministry of Social Affairs, was not included in the study.
In a shift that is seen by some to reflect a superpower that changes-of-the-guard, the world's two largest economies ef positions compared to 2016 swap effectively: in 2040, the US falls from 43rd to 64th (79.8 years), while China rises from 68th to 39th (81.9 years). Average life expectancy in the US will only increase by 1.1 years compared to the world average of 4.4 years
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The researchers found other nations In the race for longevity Canada (from 17th to 27th), Norway (12th to 20th), Australia (5th to 10th), Mexico (69th to 87th) lose and North Korea (125th to 153rd) at ground level. Taiwan slips from 35th to 42nd place.
At the top of the ranking are Indonesia (117th to 100th), Nigeria (157th to 123rd), Portugal (23rd to 5th), Poland (48th to 34th), Turkey (40th to the 15th) 26.), Saudi Arabia (61-43)
Assuming that his endless and devastating war is over, Syria will rise from 137 in 2016 to 80 in 2040 ,
For the world as a whole, researchers predicted a five-year increase in life span from 73.8 in 2016 to 77.7 in 2040.
They also predict more optimistic and more pessimistic scenarios in which life expectancy in the first case 81 years rising, and
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"The future of world health is not predetermined," said lead author Kyle Foreman, head of data science at the Institute for Health Metrics and Assessment (IHME) at the University of Washington.
"But whether we significant p rogress or stagnation depends on how well or poorly the health systems address the key health drivers."
The five main "drivers" or determinants of the average lifespan in two Decades are associated with so-called "lifestyle" diseases: high blood pressure, obesity, high blood sugar, alcohol and tobacco consumption
Sixth place is the air pollution, which scientists claim to be one million people a year in China alone
More generally, the world will see an acceleration of the shift from communicable to noncommunicable diseases, along with injuries, as a major cause of premature death.
The study is conducted every two years. In 2016, four of the ten leading causes of death were non-communicable diseases and injuries. By 2040, eight – heart, lung and kidney diseases, stroke, Alzheimer 's disease, diabetes, lung cancer and traffic accidents – will come in the top 10, the study said.
The world's poorest countries in 2018, life expectancy will remain poor, according to the study The Lancet .
With the exception of Afghanistan, the lower 30 countries by 2040 – with a projected lifespan between 57 and 69 years – are either in sub-Saharan Africa or small island states in the Pacific.
Lesotho, the Central African Republic, Zimbabwe, Somalia and Swaziland are in the basement of the rankings.
 "Inequalities will continue to be great," said IHME Director Christopher Murray.
"In a significant number of countries too many people will continue to earn relatively low incomes, remain poorly educated and die prematurely."
But nations c You could make faster progress by helping people to manage the biggest risks, especially smoking and poor nutrition, "he added in a statement.
According to the World Health Organization, tobacco consumption alone is claimed annually about seven million lives
In 2016, four of the ten most common causes of premature mortality were non-communicable diseases or injuries, and this number is expected to rise to eight out of ten in 2040.