Ligaloo:
have a look at these two website for economic impact of Australias aging population - very good resources i found
https://www.ceda.com.au/research-and-policy/research/2007/10/07/ageing_parker
http://www.health.gov.au/internet/main/publishing.nsf/Content/99E32E8D9C82E75DCA257491000E7FCD/$File/ocpanew10.pdf