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City of BrimbankPopulation forecast

City of Brimbank

Population and age structure

Between 2021 and 2031, the age structure forecasts for City of Brimbank indicate a 6.4% increase in population under working age, a 14.3% increase in population of retirement age, and a 7.6% 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 the City of Brimbank 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
City of Brimbank - Total persons202120312041Change between 2021 and 2041
Age group (years)Number%Number%Number%Number
0 to 411,3995.813,3086.214,3346.2+2,935
5 to 911,9296.112,0205.612,9375.6+1,008
10 to 1411,2405.711,4615.412,6375.5+1,397
15 to 1911,3255.812,8196.013,4415.8+2,116
20 to 2413,8007.015,4747.316,6007.2+2,800
25 to 2916,1108.217,6038.319,4938.4+3,383
30 to 3415,2167.716,8157.918,5018.0+3,285
35 to 3914,2337.215,2567.216,6167.2+2,383
40 to 4412,4086.313,8656.515,1206.5+2,712
45 to 4912,3306.313,1396.214,1186.1+1,788
50 to 5412,3236.312,2185.713,4775.8+1,154
55 to 5911,9546.112,1385.713,0135.6+1,059
60 to 6411,2405.711,5225.411,8075.1+567
65 to 699,7354.910,2814.810,6944.6+959
70 to 748,3064.28,9454.29,3964.1+1,090
75 to 795,7112.97,1953.47,8553.4+2,144
80 to 843,8672.05,1032.45,8252.5+1,958
85 and over3,5861.84,1401.95,4712.4+1,885
Total persons196,712100.0213,300100.0231,332100.0+34,620
Source: Population and household forecasts, 2021 to 2041, prepared by .id (informed decisions), July 2023.

Key findings

In 2021, the dominant age structure for persons in City of Brimbank was ages 25 to 29, which accounted for 8.2% of the total persons.

The largest increase in persons between 2021 and 2031 is forecast to be in ages 0 to 4, which is expected to increase by 1,909 and account for 6.2% of the total persons.

The largest 5 year age group in 2031 is 25 to 29 years, with a total of 17,603 persons.

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