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City of AdelaidePopulation forecast

City South

Population and age structure

Between 2021 and 2031, the age structure forecasts for City South indicate a 26.3% decrease in population under working age, a 111.3% increase in population of retirement age, and a 17.0% 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 Adelaide 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
City South - Total persons202120312046Change between 2021 and 2046
Age group (years)Number%Number%Number%Number
0 to 4992.2941.71201.7+21
5 to 91022.3611.1751.1-27
10 to 141072.4721.3931.4-14
15 to 191633.63245.93615.2+197
20 to 2473516.477014.187612.7+141
25 to 2971916.073613.593413.6+215
30 to 3457812.960611.178111.3+203
35 to 3945610.25099.36359.2+179
40 to 442986.64508.25387.8+240
45 to 492495.53957.24907.1+241
50 to 541794.02634.83855.6+206
55 to 592756.12073.83034.4+29
60 to 641653.72043.72884.2+123
65 to 691333.02704.92774.0+144
70 to 741172.61983.62463.6+128
75 to 79601.31332.41862.7+126
80 to 8490.2861.61291.9+119
85 and over431.0781.41772.6+134
Total persons4,487100.05,456100.06,893100.0+2,405
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 City South was ages 20 to 24, which accounted for 16.4% of the total persons.

The largest increase in persons between 2021 and 2031 is forecast to be in ages 15 to 19, which is expected to increase by 160 and account for 5.9% of the total persons.

The largest 5 year age group in 2031 is 20 to 24 years, with a total of 770 persons.

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