Population: 

20,090,437 (July 2005 est.)

Age structure: 

0-14 years: 19.8% (male 2,038,809/female 1,943,563)
15-64 years: 67.2% (male 6,815,600/female 6,695,189)
65 years and over: 12.9% (male 1,145,274/female 1,452,002) (2005 est.)

Median age: 

total: 36.56 years
male: 35.74 years
female: 37.4 years (2005 est.)

Population growth rate: 

0.87% (2005 est.)

Birth rate: 

12.26 births/1,000 population (2005 est.)

Death rate: 

7.44 deaths/1,000 population (2005 est.)

Net migration rate: 

3.91 migrant(s)/1,000 population (2005 est.)

Sex ratio: 

at birth: 1.05 male(s)/female
under 15 years: 1.05 male(s)/female
15-64 years: 1.02 male(s)/female
65 years and over: 0.79 male(s)/female
total population: 0.99 male(s)/female (2005 est.)

Infant mortality rate: 

total: 4.69 deaths/1,000 live births
male: 5.08 deaths/1,000 live births
female: 4.27 deaths/1,000 live births (2005 est.)

Life expectancy at birth: 

total population: 80.39 years
male: 77.52 years
female: 83.4 years (2005 est.)

Total fertility rate: 

1.76 children born/woman (2005 est.)

HIV/AIDS - adult prevalence rate: 

0.1% (2003 est.)

HIV/AIDS - people living with HIV/AIDS: 

14,000 (2003 est.)

HIV/AIDS - deaths: 

less than 200 (2003 est.)

Nationality: 

noun: Australian(s)
adjective: Australian

Ethnic groups: 

Caucasian 92%, Asian 7%, aboriginal and other 1%

Religions: 

Catholic 26.4%, Anglican 20.5%, other Christian 20.5%, Buddhist 1.9%, Muslim 1.5%, other 1.2%, unspecified 12.7%, none 15.3% (2001 Census)

Languages: 

English 79.1%, Chinese 2.1%, Italian 1.9%, other 11.1%, unspecified 5.8% (2001 Census)

Literacy: 

definition: age 15 and over can read and write
total population: 100%
male: 100%
female: 100% (1980 est.)