1. United Nations. World population prospects: The 2017 revision, key findings and advance tables. New York: United Nation; 2017. Report No.: ESA/P/WP/248.
2. Statistik Penduduk Lanjut Usia 2020 [Internet];Sari,2020
3. Profil Kesehatan Indonesia Tahun 2019;Hardhana,2020
4. WHO. Preventing chronic diseases: a vital investment. World Health Organization; 2005. 199 p.
5. Various environmental factors and their impact on subjective well-being on the older adults;Ola;Indian J Health Wellbeing,2018