https://helpagevietnam.org/en/document/older-persons-in-vietnam-an-analysis-of-the-population-change-and-family-planning-survey-2021/2026-10-06T16:45:29+07:00https://helpagevietnam.org/en/document/population-ageing-and-older-persons-in-vietnam-an-analysis-of-the-2019-viet-nam-population-and-housing-census/2026-10-06T16:45:27+07:00