“…Besides, as the United Nation points out, the projected world's average fertility would fall below the replacement rate by 2025 (The Economist, 2007). In response to the prolonged low fertility rate, the population ageing has been becoming a global issue and arising from the rising life expectancy as well as the declining fertility rate (see Hui & Yu, 2009;Hui, Li, Wong, Zheng, & Yu, 2012). According to Census and Statistics Department of Hong Kong, the elderly accounts for 13.0% (age above 65) of Hong Kong's total population in 2010.…”