Powered by .id (informed decisions) for City of Cockburn
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LEARN MORE ABOUT .idBetween 2021 and 2031, the age structure forecasts for Treeby indicate a 138.8% increase in females under working age, a 50.2% increase in females of retirement age, and a 107.5% increase in females 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 Cockburn 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 | |||||||
|---|---|---|---|---|---|---|---|
| Treeby - Total females | 2021 | 2031 | 2046 | Change between 2021 and 2046 | |||
| Age group (years) | Number | % | Number | % | Number | % | Number |
| 0 to 4 | 270 | 12.1 | 333 | 7.2 | 384 | 6.7 | +114 |
| 5 to 9 | 72 | 3.2 | 328 | 7.1 | 386 | 6.7 | +314 |
| 10 to 14 | 78 | 3.5 | 342 | 7.4 | 390 | 6.8 | +312 |
| 15 to 19 | 73 | 3.3 | 360 | 7.8 | 406 | 7.1 | +334 |
| 20 to 24 | 169 | 7.6 | 311 | 6.7 | 356 | 6.2 | +186 |
| 25 to 29 | 288 | 12.9 | 312 | 6.7 | 343 | 6.0 | +55 |
| 30 to 34 | 397 | 17.8 | 357 | 7.7 | 406 | 7.1 | +9 |
| 35 to 39 | 220 | 9.9 | 422 | 9.1 | 493 | 8.6 | +273 |
| 40 to 44 | 125 | 5.6 | 511 | 11.1 | 557 | 9.7 | +432 |
| 45 to 49 | 82 | 3.7 | 384 | 8.3 | 478 | 8.3 | +395 |
| 50 to 54 | 79 | 3.5 | 233 | 5.0 | 370 | 6.5 | +292 |
| 55 to 59 | 90 | 4.0 | 207 | 4.5 | 333 | 5.8 | +243 |
| 60 to 64 | 43 | 1.9 | 153 | 3.3 | 255 | 4.4 | +212 |
| 65 to 69 | 54 | 2.4 | 107 | 2.3 | 163 | 2.8 | +109 |
| 70 to 74 | 60 | 2.7 | 82 | 1.8 | 122 | 2.1 | +62 |
| 75 to 79 | 40 | 1.8 | 68 | 1.5 | 98 | 1.7 | +57 |
| 80 to 84 | 46 | 2.1 | 62 | 1.3 | 91 | 1.6 | +45 |
| 85 and over | 45 | 2.0 | 49 | 1.1 | 106 | 1.8 | +61 |
| Total persons | 2,233 | 100.0 | 4,623 | 100.0 | 5,738 | 100.0 | +3,505 |
Key findings
In 2021, the dominant age structure for females in Treeby was ages 30 to 34, which accounted for 17.8% of the total females.
The largest increase in females between 2021 and 2031 is forecast to be in ages 40 to 44, which is expected to increase by 386 and account for 11.1% of the total females.
The largest female 5 year age group in 2031 is 40 to 44 years, with a total of 511 females.
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