Fig. 1. Trends and prospects of old-age dependency ratio (ratio of population aged ≥65 years per 100 population aged 15–64). (A) Comparison by continents. (B) Comparison by countries. Custom data were acquired from World Population Prospects 2017, Population Division, ©(2017) United Nations ([cited 2017 Oct 16]. Available from: https://esa.un.org/unpd/wpp/DataQuery/). Reprinted with the permission of the United Nations.
