Population aging has been a major concern for many countries. Growing numbers of older people compared to younger ones in a population could create unsustainable burdens. Population aging could peak by 2040 in Germany and by 2070 in China, according to a new study published in the journal PLOS ONE, which combines new measures of aging with probabilistic population projections from the UN.
‘Based on probabilistic projections,population aging would peak and begin declining well before the end of the century for China, Germany, and the USA.’
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If a greater number of older people are dependent on a declining proportion of working-age people in the population, social support and healthcare systems will be affected. Traditional population projections categorize "old age" as a simple cutoff at age 65. But as life expectancy have increased, so too have the years that people remain healthy, active, and productive.
In the last decade, IIASA researchers have published a large body of research showing that the very boundary of "old age" should shift with changes in life expectancy, and have introduced new measures of aging that are based on population characteristics, giving a more comprehensive view of population aging.
The study combines these new measures with UN probabilistic population projections to produce a new set of age structure projections for four countries: China, Germany, Iran, and the USA.
"Both of these demographic techniques are relatively new, and together they give us a very different, and more nuanced picture of what the future of aging might look like," says Warren Sanderson, a researcher at IIASA and Stony Brook University in the USA.
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For China, Germany, and the USA, the study showed that population aging would peak and begin declining well before the end of the century. Iran, which had an extremely rapid fall in fertility rate in the last 20 years, has an unstable age distribution and the results for the country were highly uncertain.
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Source-Eurekalert