 The median age of the Riverhills population was 34 years, 4 years below the Australian median.66.7% of people living in Riverhills were born in Australia, compared to the national average of 66.7%; the next most common countries of birth were England 4.6%, New Zealand 4.4%, South Africa 1.7%, Vietnam 1.6%, Scotland 1.0%.80.6% of people spoke only English at home; the next most common languages were 2.0% Vietnamese, 1.6% Mandarin, 1.1% Persian, 1.0% Arabic, 0.8% Spanish.