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 148.5% increase in males under working age, a 70.0% increase in males of retirement age, and a 81.6% increase in males 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 males | 2021 | 2031 | 2046 | Change between 2021 and 2046 | |||
| Age group (years) | Number | % | Number | % | Number | % | Number |
| 0 to 4 | 244 | 11.4 | 373 | 9.0 | 426 | 8.7 | +182 |
| 5 to 9 | 87 | 4.1 | 363 | 8.7 | 422 | 8.6 | +334 |
| 10 to 14 | 79 | 3.7 | 283 | 6.8 | 350 | 7.1 | +271 |
| 15 to 19 | 78 | 3.7 | 306 | 7.4 | 362 | 7.4 | +284 |
| 20 to 24 | 118 | 5.5 | 376 | 9.1 | 388 | 7.9 | +270 |
| 25 to 29 | 270 | 12.6 | 307 | 7.4 | 322 | 6.6 | +53 |
| 30 to 34 | 347 | 16.2 | 289 | 7.0 | 314 | 6.4 | -34 |
| 35 to 39 | 286 | 13.3 | 291 | 7.0 | 328 | 6.7 | +42 |
| 40 to 44 | 175 | 8.1 | 309 | 7.4 | 311 | 6.3 | +136 |
| 45 to 49 | 71 | 3.3 | 294 | 7.1 | 298 | 6.1 | +226 |
| 50 to 54 | 63 | 2.9 | 223 | 5.4 | 266 | 5.4 | +204 |
| 55 to 59 | 62 | 2.9 | 192 | 4.6 | 248 | 5.0 | +186 |
| 60 to 64 | 39 | 1.8 | 154 | 3.7 | 217 | 4.4 | +178 |
| 65 to 69 | 63 | 2.9 | 106 | 2.6 | 158 | 3.2 | +95 |
| 70 to 74 | 60 | 2.8 | 83 | 2.0 | 122 | 2.5 | +63 |
| 75 to 79 | 57 | 2.6 | 79 | 1.9 | 129 | 2.6 | +72 |
| 80 to 84 | 31 | 1.4 | 80 | 1.9 | 126 | 2.6 | +95 |
| 85 and over | 19 | 0.9 | 43 | 1.0 | 135 | 2.7 | +116 |
| Total persons | 2,148 | 100.0 | 4,153 | 100.0 | 4,921 | 100.0 | +2,773 |
Key findings
In 2021, the dominant age structure for males in Treeby was ages 30 to 34, which accounted for 16.2% of the total males.
The largest increase in males between 2021 and 2031 is forecast to be in ages 5 to 9, which is expected to increase by 275 and account for 8.7% of the total males.
The largest male 5 year age group in 2031 is 20 to 24 years, with a total of 376 males.
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