1. Ageing and Health Unit , Department of Maternal, Newborn, Child and Adolescent Health and Ageing, WHO HQ, Geneva, Switzerland
2. Demographic Change and Healthy Aging Unit , Social Determinants of Health, World Health Organization, Geneva, Switzerland
3. Faculty of Medicine and Health Sciences , Nottingham University Hospitals NHS Trust, Nottingham, UK
4. Division of Geriatric Medicine at the Ministry of Health , Nairobi, Kenya
5. Demographic Analysis Section , Population Division, Department of Economic and Social Affairs United Nations, New York, NY, USA
6. Population and Development Branch , Technical Division United Nations Population Fund, New York, USA
7. International Telecommunication Union (ITU) , ICT Data and Analytics Division, Geneva, Switzerland
8. Department of Statistics , The International Labour Organization, Geneva, Switzerland
9. Economic , Social and Cultural Rights Section, Office of the United Nations High Commissioner for Human Rights (OHCHR), Geneva, Switzerland
10. Directorate for Employment , Labour and Social Affairs, Organization for Economic Co-operation and Development, Paris, France
11. Epidemiology , Monitoring and Evaluation Unit, Department of Maternal, Newborn, Child and Adolescent Health and Ageing, WHO HQ, Geneva, Switzerland