1. United Nations, Department of Economic and Social Affairs, Population Division. World Population Prospects Highlights (ST/ESA/SER.A/423). (United Nations, New York, 2019).
2. Olshansky, S. J. From lifespan to healthspan. JAMA 320, 1323–1324 (2018).
3. WHO. World Health Statistics. (World Health Organization, Geneva, 2020).
4. Partridge, L., Deelen, J. & Slagboom, P. E. Facing up to the global challenges of ageing. Nature 561, 45–56 (2018).
5. WHO. World Health Statistics: Monitoring health for the SDGs, sustainable development goals. (World Health Organization, Geneva 2020).