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City of BrimbankPopulation forecast

Derrimut

Population and age structure

Between 2021 and 2031, the age structure forecasts for Derrimut indicate a 29.8% decrease in population under working age, a 56.7% increase in population of retirement age, and a 0.7% decrease 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
Derrimut - Total persons202120312041Change between 2021 and 2041
Age group (years)Number%Number%Number%Number
0 to 47388.55406.65686.9-171
5 to 993910.85576.85797.0-360
10 to 148059.26457.96027.3-203
15 to 195716.57389.06087.4+37
20 to 244995.76427.86107.4+111
25 to 295646.55396.66097.4+45
30 to 346387.35646.96227.5-16
35 to 3995410.96397.86628.0-292
40 to 448569.86217.66207.5-236
45 to 496427.46658.15426.6-100
50 to 544615.35907.24695.7+8
55 to 593423.94445.44615.6+120
60 to 642853.33274.04115.0+126
65 to 691782.02483.03163.8+138
70 to 741201.42022.52342.8+114
75 to 79810.91241.51712.1+91
80 to 84360.4680.81171.4+81
85 and over190.2380.5550.7+36
Total persons8,727100.08,191100.08,255100.0-471
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 Derrimut was ages 35 to 39, which accounted for 10.9% of the total persons.

The largest increase in persons between 2021 and 2031 is forecast to be in ages 15 to 19, which is expected to increase by 166 and account for 9.0% of the total persons.

The largest 5 year age group in 2031 is 15 to 19 years, with a total of 738 persons.

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