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City of RockinghamPopulation forecast

Secret Harbour

Population and age structure

Between 2021 and 2031, the age structure forecasts for Secret Harbour indicate a 25.7% decrease in population under working age, a 100.5% increase in population of retirement age, and a 4.3% increase 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 Rockingham 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
Secret Harbour - Total persons202120312046Change between 2021 and 2046
Age group (years)Number%Number%Number%Number
0 to 48456.57285.57565.6-89
5 to 91,1528.98486.48636.4-289
10 to 141,38410.79377.18706.5-514
15 to 191,1669.01,0157.78796.6-287
20 to 247425.71,1058.49737.3+231
25 to 296425.08996.88966.7+254
30 to 347395.77285.57755.8+36
35 to 399327.27555.78306.2-102
40 to 441,1328.79197.08616.4-271
45 to 491,0998.51,0387.98986.7-201
50 to 541,1418.89327.08546.4-287
55 to 598046.29757.49497.1+145
60 to 644403.48506.48726.5+432
65 to 692742.15714.36655.0+391
70 to 742121.63622.75243.9+312
75 to 791451.12221.73963.0+251
80 to 84630.51781.32611.9+198
85 and over490.41571.22922.2+243
Total persons12,961100.013,219100.013,415100.0+454
Source: Population and household forecasts, 2021 to 2046, prepared by .id (informed decisions), December 2023.

Key findings

In 2021, the dominant age structure for persons in Secret Harbour was ages 10 to 14, which accounted for 10.7% of the total persons.

The largest increase in persons between 2021 and 2031 is forecast to be in ages 60 to 64, which is expected to increase by 410 and account for 6.4% of the total persons.

The largest 5 year age group in 2031 is 20 to 24 years, with a total of 1,105 persons.

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