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Sutherland Shire CouncilPopulation forecast


Population and age structure

Between 2016 and 2026, the age structure forecasts for Illawong indicate a 19.6% increase in population under working age, a 50.8% increase in population of retirement age, and a 15.1% decrease 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 Illawong 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
Illawong - Total persons201620262036Change between 2016 and 2036
Age group (years)Number%Number%Number%Number
0 to 44055.34686.14325.6+28
5 to 93835.05407.05046.5+122
10 to 144786.35066.65467.1+68
15 to 195276.95146.75887.6+61
20 to 245987.95006.55146.7-84
25 to 294736.23514.63514.6-122
30 to 344125.43164.13033.9-109
35 to 393985.23514.63314.3-67
40 to 444546.04155.43985.2-56
45 to 494776.34686.14585.9-20
50 to 545907.75146.74996.5-91
55 to 596798.94836.34846.3-195
60 to 646047.95116.74706.1-134
65 to 694696.25427.14245.5-44
70 to 742603.44636.04145.4+154
75 to 791912.53444.54085.3+217
80 to 84911.21842.43074.0+216
85 and over1321.71912.52733.5+141
Total persons7,619100.07,662100.07,704100.0+85
Population and household forecasts, 2016 to 2036, prepared by .id , the population experts, October 2017.

Key findings

In 2016, the dominant age structure for persons in Illawong was ages 55 to 59, which accounted for 8.9% of the total persons.

The largest increase in persons between 2016 and 2026 is forecast to be in ages 70 to 74, which is expected to increase by 203 and account for 6.0% of the total persons.

The largest 5 year age group in 2026 is 65 to 69 years, with a total of 542 persons.

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