1. Kawas CH, Legdeur N, Corrada MM. What have we learned from cognition in the oldest-old. Curr Opin Neurol. 2021;34(2):258–265. https://doi.org/10.1097/WCO.0000000000000910
2. United Nations, Department of Economic and Social Affairs, Population Division, Population Estimates and Projections Section. World Population Prospects, the 2019 Revision. Probabilistic Population Projections based on the World Population Prospects 2019. Total population (both sexes combined) by five-year age group, region, subregion and country, 2020–2100. Median (50 percent) prediction interval, 2020–2100. https://population.un.org/wpp/Download/Probabilistic/Population/
3. United Nations, Department of Economic and Social Affairs, Population Division, Population Estimates and Projections Section. World Population Prospects, the 2019 Revision. Probabilistic Population Projections based on the World Population Prospects 2019. Probabilistic projection of total population (both sexes combined) by region, subregion, country or area, 2020–2100. Median (50 percent) prediction interval, 2020–2100 https://population.un.org/wpp/Download/Probabilistic/Population/
4. Byulleten’ “Chislennost’ naseleniya Rossijskoj Federacii po polu i vozrastu na 1 yanvarya 2010 goda”. (In Russ.). https://gks.ru/bgd/regl/B10_111/Main.htm (дата обращения: 01.03.2023)
5. Byulleten’ “Chislennost’ naseleniya Rossijskoj Federacii po polu i vozrastu na 1 yanvarya 2020 goda”. (In Russ.). https://gks.ru/bgd/regl/b20_111/Main.htm (дата обращения: 01.03.2023)