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We are experiencing a global demographic transition of rapid population ageing, stemming from declines in both fertility and mortality rates. However, what is not fully appreciated is that this will disproportionately affect low-income and middle-income countries. Multiple sources estimate that by 2050, 80% of older people, aged 60 years and older, will live in low-income and middle-income countries, and that the rate of increase in the older adult population will surpass that of high-income countries.
The Lancet Healthy Longevity (Thu,) studied this question.