According to the World Health Organization (WHO), all countries face major challenges in adapting health and social systems to the rapid aging of the population, as the proportion of people over 60 is expected to nearly double from 12% to 22% between 2015 and 2050, and since the year 2020 older adults have already outnumbered children under 5 years globally ...
Antonelli et al. (Mon,) studied this question.