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City of OnkaparingaPopulation forecast

City of Onkaparinga

Population and age structure

Between 2016 and 2026, the age structure forecasts for the City of Onkaparinga indicate a 14.4% increase in population under working age, a 26.2% increase in population of retirement age, and a 9.0% 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 Onkaparinga 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 of Onkaparinga - Total persons201620262036Change between 2016 and 2036
Age group (years)Number%Number%Number%Number
0 to 410,8266.411,9716.313,2326.2+2,406
5 to 910,9466.512,2516.413,5756.4+2,629
10 to 1410,1066.012,2506.413,5326.4+3,426
15 to 1910,6536.311,7716.213,1066.2+2,452
20 to 2410,6676.311,0095.812,5695.9+1,901
25 to 2910,5216.211,9846.313,2116.2+2,690
30 to 3411,2256.612,7806.713,9616.6+2,736
35 to 3910,6426.312,9676.814,4456.8+3,802
40 to 4411,0076.513,0496.814,5456.9+3,538
45 to 4911,3626.712,1546.413,9826.6+2,620
50 to 5411,1516.611,4266.013,1266.2+1,975
55 to 5911,0746.610,9935.811,9865.6+911
60 to 6410,5066.210,4935.511,1835.3+677
65 to 6910,0355.99,9495.210,3904.9+355
70 to 746,9094.18,9144.79,3054.4+2,395
75 to 794,5682.77,7294.18,0613.8+3,493
80 to 843,2251.94,8342.56,1842.9+2,959
85 and over3,4892.14,1882.25,7792.7+2,290
Total persons168,915100.0190,712100.0212,172100.0+43,257
Population and household forecasts, 2016 to 2036, prepared by .id , the population experts, March 2020.

Key findings

In 2016, the dominant age structure for persons in the City of Onkaparinga was ages 45 to 49, which accounted for 6.7% of the total persons.

The largest increase in persons between 2016 and 2026 is forecast to be in ages 75 to 79, which is expected to increase by 3,161 and account for 4.1% of the total persons.

The largest 5 year age group in 2026 is 40 to 44 years, with a total of 13,049 persons.

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