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AustraliaPopulation forecast


Population and age structure

Between 2020 and 2031, the age structure forecasts for Australia indicate a 0.4% increase in population under working age, a 32.9% increase in population of retirement age, and a 8.7% increase in population of working age.

Knowledge of how the age structure of the population is changing is essential for planning age-based facilities and services, such as child care, recreation and aged care.

The forecast age groups of Australia is a function of the current age of the population (people aging each year, being born and dying) as well as the age of people migrating into and out of the area. This in turn is driven by location (fringe, city centre, regional or rural) the existing housing stock (separate dwellings, medium or high density), the amount and type of new residential development (same as existing stock, or diversifying) and where the area is in a cycle of change. We call this the area’s residential role and function. You can learn more about this in the section household and suburb life cycles.

Forecast age structure - 5 year age groups
Australia - Total persons202020312041Change between 2020 and 2041
Age group (years)Number%Number%Number%Number
0 to 41,561,5316.11,569,5355.51,699,6825.4+138,150
5 to 91,626,3776.31,613,4035.71,674,9485.3+48,571
10 to 141,594,2826.21,617,6265.71,684,1315.4+89,848
15 to 191,504,1895.91,747,0626.11,756,3325.6+252,143
20 to 241,755,5726.81,916,8456.71,963,1046.3+207,532
25 to 291,917,2867.51,881,4806.62,206,5397.0+289,254
30 to 341,916,9947.51,943,3226.82,242,0057.1+325,011
35 to 391,828,0437.12,024,1537.12,067,9456.6+239,902
40 to 441,613,7976.31,988,1307.02,051,8706.5+438,073
45 to 491,668,9326.51,884,0096.62,071,6116.6+402,679
50 to 541,554,6546.11,634,9975.71,987,7466.3+433,091
55 to 591,540,2356.01,603,0295.61,851,2905.9+311,056
60 to 641,416,9615.51,545,4165.41,590,6595.1+173,698
65 to 691,240,5384.81,453,2705.11,538,6964.9+298,158
70 to 741,093,8634.31,330,9014.71,444,8034.6+350,940
75 to 79767,8843.01,094,9433.81,289,6564.1+521,773
80 to 84524,8612.0867,7453.01,067,4983.4+542,637
85 and over522,5072.0766,5162.71,181,5863.8+659,079
Total persons25,648,508100.028,482,381100.031,370,103100.0+5,721,595
Population and household forecasts, 2020 to 2041, prepared by .id (informed decisions), November 2020.

Key findings

In 2020, the dominant age structure for persons in Australia was ages 25 to 29, which accounted for 7.5% of the total persons.

The largest increase in persons between 2020 and 2031 is forecast to be in ages 40 to 44, which is expected to increase by 374,332 and account for 7.0% of the total persons.

The largest 5 year age group in 2031 is 35 to 39 years, with a total of 2,024,153 persons.

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