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Shire of Serpentine JarrahdalePopulation forecast

Shire of Serpentine Jarrahdale

Population and age structure

Between 2021 and 2031, the age structure forecasts for Shire of Serpentine Jarrahdale indicate a 35.8% increase in males under working age, a 66.4% increase in males of retirement age, and a 69.7% 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 Shire of Serpentine Jarrahdale 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
Shire of Serpentine Jarrahdale - Total males202120312046Change between 2021 and 2046
Age group (years)Number%Number%Number%Number
0 to 41,5018.92,0827.73,9468.2+2,445
5 to 91,4688.71,9777.33,7227.7+2,254
10 to 141,3608.11,8186.73,1156.4+1,755
15 to 191,0026.01,6866.32,7505.7+1,748
20 to 249295.51,8036.72,8045.8+1,875
25 to 291,0746.41,9267.13,3416.9+2,267
30 to 341,3608.12,2878.54,0018.3+2,640
35 to 391,3738.22,0837.73,9878.2+2,614
40 to 441,1346.82,1227.93,6827.6+2,548
45 to 491,0466.21,9917.43,3386.9+2,292
50 to 541,1026.61,6636.23,0966.4+1,994
55 to 599885.91,4495.42,9996.2+2,010
60 to 647544.51,2514.62,3614.9+1,607
65 to 695683.41,1184.11,8663.9+1,297
70 to 745213.17532.81,3562.8+835
75 to 793101.83961.58521.8+542
80 to 841851.13051.16021.2+417
85 and over1060.62410.95461.1+440
Total persons16,781100.026,952100.048,362100.0+31,581
Source: Population and household forecasts, 2021 to 2046, prepared by .id (informed decisions), December 2023.

Key findings

In 2021, the dominant age structure for males in Shire of Serpentine Jarrahdale was ages 0 to 4, which accounted for 8.9% of the total males.

The largest increase in males between 2021 and 2031 is forecast to be in ages 40 to 44, which is expected to increase by 989 and account for 7.9% of the total males.

The largest male 5 year age group in 2031 is 30 to 34 years, with a total of 2,287 males.

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