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City of KwinanaPopulation forecast


Population and age structure

Between 2016 and 2026, the age structure forecasts for Casuarina indicate a 10.4% decrease in population under working age, a 88.0% increase in population of retirement age, and a 22.2% 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 Casuarina 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
Casuarina - Total persons201620262036Change between 2016 and 2036
Age group (years)Number%Number%Number%Number
0 to 4291.6543.596810.6+939
5 to 9402.2463.07748.5+734
10 to 14754.1291.94414.8+366
15 to 191065.8483.23934.3+287
20 to 2427014.815310.18339.1+563
25 to 2923813.018512.21,25813.8+1,020
30 to 3420511.222314.71,26413.9+1,059
35 to 391709.316110.69019.9+731
40 to 441749.51137.45896.5+415
45 to 491387.6996.54274.7+289
50 to 541417.7966.42853.1+144
55 to 59915.0905.92372.6+146
60 to 64744.1825.41812.0+107
65 to 69311.7513.41481.6+117
70 to 7490.5432.81491.6+140
75 to 79261.4211.41031.1+77
80 to 8440.290.6720.8+68
85 and over50.3171.1951.0+90
Total persons1,826100.01,519100.09,117100.0+7,291
Population and household forecasts, 2016 to 2036, prepared by .id , the population experts, March 2018.

Key findings

In 2016, the dominant age structure for persons in Casuarina was ages 20 to 24, which accounted for 14.8% of the total persons.

The largest increase in persons between 2016 and 2026 is forecast to be in ages 70 to 74, which is expected to increase by 34 and account for 2.8% of the total persons.

The largest 5 year age group in 2026 is 30 to 34 years, with a total of 223 persons.

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