1. World Population Ageing 2020, United Nations, Department of Economic and Social Affairshttps://www.un.org/development/desa/pd/sites/www.un.org.development.desa.pd/files/files/documents/2020/Nov/undesa_pd-2020_world_population_ageing_highlights.pdf
2. World Social Report 2020, United Nations, Department of Economic and Social Affairshttps://www.un.org/development/desa/dspd/wp-content/uploads/sites/22/2020/02/World-Social-Report2020-FullReport.pdf
3. https://www.statista.com/statistics/271056/age-distribution-in-spain/
4. Projections of Demand for and Costs of Social Care for Older People and Younger Adults in England. PSSRU 2015http://eprints.lse.ac.uk/id/eprint/40720