Joseph Dieleman (Washington) and coauthors on new population aging metric
"At what age do you feel 65?" - EurekAlert!. 3/8/2019.
"A 30-year gap separates countries with the highest and lowest ages at which people experience the health problems of a 65-year-old, according to a new scientific study.
Researchers found 76-year-olds in Japan and 46-year-olds in Papua New Guinea have the same level of age-related health problems as an "average" person aged 65."