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https://ec.europa.eu/eurostat/statistics-explained/index.php?title=Population_structure_and_ageing
3. The 2021 Ageing Report. Economic and Budgetary Projections for the EU Member States (2019–2070),2021
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5. Developing specialist healthcare for older people: A challenge for the European Union;Neil;J. Nutr. Health Aging,2004