1. By 2050, A Quarter of the World’s People Will Be African–This Will Shape Our Future, The Guardian
https://theguardian.com/global-development/2022/jan/20/by-2050-a-quarter-of-the-worlds-people-will-be-african-this-will-shape-our-future
2. Aging in Asia: Trends, Impacts and Responses, ADB Working Paper on Regional Economic Integration No. 25, Asian Development Bank
https:/adb.org/sites/default/files/publication/28500/wp25-aging-asia.pdf
3. Attitudes about Aging: A Global Perspective
https://pewresearch.org/global/2014/01/30/chapter-2-aging-in-the-u-s-and-other-countries-2010-to-2050
4. Coming of age: Infographic on global population trends;Ruiz;Financ. Dev.,2020
5. World Family Planning 2020, Highlights
https://un.org/development/desa/pd/sites/www.un.org.development.desa.pd/files/files/documents/2020/Sep/unpd_world_family_planning_2020_10_key_messages.pdf