*2.1. Data*

The Australian Bureau of Statistics (ABS) Census data of 2006, 2011 and 2016, which include the distribution of usual residents in the households by different ages, were used. Given that regions with a rapid population growth, such as the Greater Brisbane Region, are especially sensitive to population ageing, which will necessarily involve substantial increases in public expenditure on health and aged care, the Greater Brisbane Region was chosen as the case locality for the data analysis. In particular, this region has become the popular retirement destination for older Australians [21], with some areas such as the Bribie Island with the oldest median age (60.6 years) in the capital city region. The Greater Brisbane Region comprises eight local government areas and covers a total area of around 15,800 square kilometres, or 1% of Queensland's total area, but was home to 2.27 million people, almost half of Queensland's population, which is about 4.7 million [22].
