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The Hills Shire CouncilPopulation forecast

Castle Hill

Population and age structure

Between 2021 and 2030, the age structure forecasts for Castle Hill indicate a 7.8% increase in females under working age, a 11.5% increase in females of retirement age, and a 12.2% 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 Hills Shire Council 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
Castle Hill - Total females202120302036Change between 2021 and 2036
Age group (years)Number%Number%Number%Number
0 to 48424.71,0725.41,1865.4+344
5 to 91,2476.91,2896.41,4326.6+186
10 to 141,3777.71,3756.91,5487.1+170
15 to 191,1546.41,3356.71,3876.4+234
20 to 249985.61,0785.41,1425.2+143
25 to 296743.88434.29304.3+256
30 to 349045.01,0815.41,1805.4+276
35 to 391,3287.41,4807.41,6407.5+311
40 to 441,4928.31,6218.11,7988.3+306
45 to 491,3907.71,5998.01,7257.9+335
50 to 541,2496.91,4187.11,5647.2+315
55 to 591,1176.21,2316.21,3546.2+237
60 to 641,0585.91,0635.31,1765.4+118
65 to 691,0365.89925.01,0494.8+13
70 to 748824.98624.38704.0-13
75 to 796053.47313.77183.3+113
80 to 843311.85632.85922.7+262
85 and over2971.63661.84722.2+176
Total persons17,982100.019,999100.021,763100.0+3,781
Source: Population and household forecasts, 2021 to 2036, prepared by .id (informed decisions), January 2023.

Key findings

In 2021, the dominant age structure for females in Castle Hill was ages 40 to 44, which accounted for 8.3% of the total females.

The largest increase in females between 2021 and 2030 is forecast to be in ages 80 to 84, which is expected to increase by 232 and account for 2.8% of the total females.

The largest female 5 year age group in 2030 is 40 to 44 years, with a total of 1,621 females.

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