1. Estimated Population by Age Grouphttp://kostat.go.kr
2. Future life expectancy in 35 industrialised countries: projections with a Bayesian model ensemble
3. 2018 National Health Insurance Statistical Yearbookhttp://www.hira.or.kr/bbsDummy.do?pgmid=HIRAA020045020000&brdScnBltNo=4&brdBltNo=2311&pageIndex=1#none
4. Efficient Management Plan for Elderly Medical Expenses in Preparation for an Aging Societyhttps://www.nhis.or.kr/nhis/together/wbhaec07800m01.do?mode=view&articleNo=123576
5. 2017 Elderly Status Survey Ministry of Health and Welfare & Korea Institute for Health and Social Affairshttp://www.mohw.go.kr/react/jb/sjb030301vw.jsp?PAR_MENU_ID=03&MENU_ID=032901&page=1&CONT_SEQ=344953