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AustraliaPopulation forecast


Population and age structure

Between 2021 and 2031, the age structure forecasts for Australia indicate a 0.2% decrease in population under working age, a 29.7% increase in population of retirement age, and a 8.8% 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.

Forecast age structure - 5 year age groups
Australia - Total persons202120312041Change between 2021 and 2041
Age group (years)Number%Number%Number%Number
0 to 41,522,7805.91,541,3955.41,726,7845.5+204,004
5 to 91,630,2436.31,592,4005.61,675,5975.3+45,354
10 to 141,611,2466.31,622,5095.71,670,8465.3+59,600
15 to 191,485,6585.81,776,8266.21,766,6915.6+281,033
20 to 241,652,3526.41,995,5787.02,051,1566.5+398,804
25 to 291,856,3747.21,918,8816.72,294,2097.3+437,835
30 to 341,911,3777.41,866,4876.62,292,7217.3+381,343
35 to 391,856,8037.21,953,9646.92,070,9416.6+214,138
40 to 441,643,5006.41,970,4496.91,962,4296.2+318,928
45 to 491,639,3286.41,874,2996.61,991,2676.3+351,939
50 to 541,601,2506.21,623,2595.71,955,5486.2+354,298
55 to 591,537,6026.01,591,2485.61,825,3665.8+287,764
60 to 641,460,9185.71,540,2005.41,566,4885.0+105,570
65 to 691,278,9325.01,457,9605.11,519,8224.8+240,890
70 to 741,137,3034.41,343,3994.71,435,6694.6+298,366
75 to 79811,9303.21,111,6663.91,294,7714.1+482,840
80 to 84547,3472.1885,0403.11,085,7153.5+538,368
85 and over542,1222.1801,8782.81,246,7864.0+704,664
Total persons25,727,066100.028,467,438100.031,432,805100.0+5,705,739
Source: .id SAFi National to State tops-down forecast, 4.3.1, published May 2021. Prepared by .id (informed decisions)

Key findings

In 2021, the dominant age structure for persons in Australia was ages 30 to 34, which accounted for 7.4% of the total persons.

The largest increase in persons between 2021 and 2031 is forecast to be in ages 20 to 24, which is expected to increase by 343,227 and account for 7.0% of the total persons.

The largest 5 year age group in 2031 is 20 to 24 years, with a total of 1,995,578 persons.

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