Current social conservative politics have led to a welfare state that is increasingly focused on working families with children. This is true of the Howard Government and more recently in the US the $300 rebate (to keep the economy strong or some rubbish) was an extra $300 per child. Richard Florida argues the inverse is true:

Furthermore, one group that has been neglected by most communities, at least until recently, is young people. Young people have typically been thought of as transients who contribute little to a city's bottom line. But in the creative age they matter for two reasons.

First they are workhorses. ... [and] Second, people are staying single longer.

He argues that young people are a driving force behind dynamic creative economies, and are more important economically than the traditional suburban nuclear family to economic wealth and success for a region. (more)
The NSW government has population demographics broken down by health areas. I am assuming AHS means Area Health Sector. The most interesting part of the graph is the 19-34 demographic which dips in the country regions, is flat in Sydney's north and west, and increases in the city's south and south-west. (more)
Cam Riley: South Sea Republic. Freedom, liberty, equity and an Australian Republic.