This simple site presents age demographics within selected areas in South / East Asia, including world rank and population.
Its aim is to help provide a quick and simple insight for organizations looking at potential markets and/or "production" operations. There are many other factors (not shown here) which should be considered when making decisions.
Data source: The World Factbook 2021. Washington, DC: Central Intelligence Agency, 2021. https://www.cia.gov/the-world-factbook/
Each graph shows: country population ranking (among all countries) / population (in millions) / country name