1. Census and Statistics Department, HKSAR. Hong Kong population projections 2012–2041 [Internet]. 2012. Available from: https://www.statistics.gov.hk/pub/B1120015052012XXXXB0100.pdf
2. China National Committee on Aging. Prediction Report on the Development Trend of Population Aging in China. [Internet]. China National Committee on Aging; 2017. Available from: http://www.cncaprc.gov.cn/contents/16/11224.html
3. Chief Secretary for Administration’s Office. Population policy strategies and initiatives [Internet]. Chief Secretary for Administration’s Office; 2015. Available from: https://www.hkpopulation.gov.hk/public_engagement/pdf/PPbooklet2015_ENG.pdf
4. Financial Services and the Treasury Bureau. Working Group on Long-Term Fiscal Planning [Internet]. Hong Kong: Financial Services and the Treasury Bureau; 2014. Available from: https://www.fstb.gov.hk/tb/en/working-group-on-longterm-fiscal-planning.htm
5. World Health Organization. Physical Activity and Older Adults [Internet]. World Health Organization. 2015. Available from: https://www.who.int/dietphysicalactivity/factsheet_olderadults/en/