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LEARN MORE ABOUT .idIn 2021, the largest age group in the City of Onkaparinga was 35 to 39 year olds. The group that changed the most since 1991 was 55 to 59 year olds, increasing by 7,010 people.
The Age Structure of the City of Onkaparinga provides key insights into the level of demand for age based services and facilities such as child care. It is also an indicator of the City of Onkaparinga's residential role and function and how it is likely to change in the future.
Five year age groups present a classic age profile of the population. Each age group covers exactly five years, which enables direct comparison between each group.
To get a more complete picture the City of Onkaparinga's Age Structure should be viewed in conjunction with Household Types and Dwelling Types.
Q:
Derived from the Census question:
'What is the person's date of birth or age?'
| Age structure - Five year age groups | |||||||
|---|---|---|---|---|---|---|---|
| City of Onkaparinga - Total persons (Enumerated) | 2021 | 1991 | Change | ||||
| Five year age groups (years) | Number | % | Coromandel Valley % | Number | % | Coromandel Valley % | 1991 to 2021 |
| 0 to 4 | 9,371 | 5.4 | 5.6 | 10,629 | 8.4 | 9.7 | -1,259 |
| 5 to 9 | 10,778 | 6.3 | 8.4 | 11,772 | 9.2 | 10.6 | -994 |
| 10 to 14 | 10,815 | 6.3 | 7.7 | 11,273 | 8.9 | 11.3 | -459 |
| 15 to 19 | 10,213 | 5.9 | 7.0 | 10,433 | 8.2 | 9.0 | -221 |
| 20 to 24 | 9,704 | 5.6 | 4.8 | 8,494 | 6.7 | 4.1 | +1,209 |
| 25 to 29 | 10,218 | 5.9 | 4.1 | 9,650 | 7.6 | 4.2 | +567 |
| 30 to 34 | 10,854 | 6.3 | 5.4 | 11,413 | 9.0 | 9.8 | -559 |
| 35 to 39 | 11,591 | 6.7 | 6.3 | 11,840 | 9.3 | 10.8 | -249 |
| 40 to 44 | 10,636 | 6.2 | 8.1 | 11,896 | 9.3 | 12.3 | -1,261 |
| 45 to 49 | 10,949 | 6.4 | 8.0 | 7,510 | 5.9 | 6.3 | +3,439 |
| 50 to 54 | 11,383 | 6.6 | 6.7 | 5,163 | 4.1 | 4.3 | +6,219 |
| 55 to 59 | 10,982 | 6.4 | 6.3 | 3,971 | 3.1 | 2.0 | +7,010 |
| 60 to 64 | 10,794 | 6.3 | 6.6 | 3,881 | 3.0 | 2.1 | +6,912 |
| 65 to 69 | 10,046 | 5.8 | 5.5 | 3,487 | 2.7 | 1.1 | +6,558 |
| 70 to 74 | 9,640 | 5.6 | 5.3 | 2,697 | 2.1 | 1.2 | +6,943 |
| 75 to 79 | 6,508 | 3.8 | 2.7 | 1,905 | 1.5 | 0.4 | +4,602 |
| 80 to 84 | 3,975 | 2.3 | 1.0 | 842 | 0.7 | 0.2 | +3,132 |
| 85 and over | 3,855 | 2.2 | 0.6 | 410 | 0.3 | 0.5 | +3,444 |
| Total population | 172,312 | 100.0 | 100.0 | 127,277 | 100.0 | 100.0 | +45,034 |
Dominant groups
Analysis of the five year age groups of the City of Onkaparinga in 2021 compared to Coromandel Valley shows that there was a lower proportion of people in the younger age groups (under 15) and a higher proportion of people in the older age groups (65+).
Overall, 18.0% of the population was aged between 0 and 15, and 19.7% were aged 65 years and over, compared with 21.7% and 15.0% respectively for Coromandel Valley.
The major differences between the age structure of the City of Onkaparinga and Coromandel Valley were:
- A larger percentage of persons aged 25 to 29 (5.9% compared to 4.1%)
- A larger percentage of persons aged 85 and over (2.2% compared to 0.6%)
- A smaller percentage of persons aged 5 to 9 (6.3% compared to 8.4%)
- A smaller percentage of persons aged 40 to 44 (6.2% compared to 8.1%)
Emerging groups
From 1991 to 2021, City of Onkaparinga's population increased by 45,035 people (35.4%). This represents an average annual population change of 1.01% per year over the period.
The largest changes in age structure in this area between 1991 and 2021 were in the age groups:
- 55 to 59 (+7,010 persons)
- 70 to 74 (+6,943 persons)
- 60 to 64 (+6,912 persons)
- 65 to 69 (+6,558 persons)
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