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LEARN MORE ABOUT .idIn 2021, the largest age group in the Northern District was 60 to 64 year olds. The group that changed the most since 2011 was 70 to 74 year olds, increasing by 1,387 people.
The Age Structure of the Northern District 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 Northern District'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 Northern District'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 | |||||||
|---|---|---|---|---|---|---|---|
| Northern District - Total persons (Usual residence) | 2021 | 2011 | Change | ||||
| Five year age groups (years) | Number | % | City of Onkaparinga % | Number | % | City of Onkaparinga % | 2011 to 2021 |
| 0 to 4 | 2,113 | 5.2 | 5.4 | 2,434 | 6.0 | 6.6 | -321 |
| 5 to 9 | 2,430 | 5.9 | 6.2 | 2,421 | 6.0 | 6.3 | +9 |
| 10 to 14 | 2,544 | 6.2 | 6.2 | 2,747 | 6.8 | 6.7 | -203 |
| 15 to 19 | 2,468 | 6.0 | 5.8 | 2,951 | 7.3 | 6.8 | -483 |
| 20 to 24 | 2,177 | 5.3 | 5.6 | 2,525 | 6.3 | 6.2 | -348 |
| 25 to 29 | 2,105 | 5.1 | 6.0 | 2,258 | 5.6 | 6.4 | -153 |
| 30 to 34 | 2,454 | 6.0 | 6.3 | 2,476 | 6.1 | 6.2 | -22 |
| 35 to 39 | 2,732 | 6.7 | 6.7 | 2,710 | 6.7 | 6.6 | +22 |
| 40 to 44 | 2,714 | 6.6 | 6.1 | 2,858 | 7.1 | 7.1 | -144 |
| 45 to 49 | 2,630 | 6.4 | 6.4 | 2,996 | 7.4 | 7.1 | -366 |
| 50 to 54 | 2,673 | 6.5 | 6.6 | 3,234 | 8.0 | 7.0 | -561 |
| 55 to 59 | 2,659 | 6.5 | 6.5 | 2,918 | 7.2 | 6.6 | -259 |
| 60 to 64 | 2,787 | 6.8 | 6.3 | 2,787 | 6.9 | 6.5 | 0 |
| 65 to 69 | 2,583 | 6.3 | 5.9 | 1,659 | 4.1 | 4.6 | +924 |
| 70 to 74 | 2,480 | 6.1 | 5.7 | 1,093 | 2.7 | 3.2 | +1,387 |
| 75 to 79 | 1,522 | 3.7 | 3.8 | 806 | 2.0 | 2.4 | +716 |
| 80 to 84 | 885 | 2.2 | 2.3 | 705 | 1.8 | 2.0 | +180 |
| 85 and over | 964 | 2.4 | 2.2 | 691 | 1.7 | 1.8 | +273 |
| Total population | 40,920 | 100.0 | 100.0 | 40,269 | 100.0 | 100.0 | +651 |
Dominant groups
Analysis of the five year age groups of the Northern District in 2021 compared to the City of Onkaparinga shows that there was a similar proportion of people in the younger age groups (under 15) and a higher proportion of people in the older age groups (65+).
Overall, 17.3% of the population was aged between 0 and 15, and 20.6% were aged 65 years and over, compared with 17.7% and 19.9% respectively for the City of Onkaparinga.
The major difference between the age structure of the Northern District and the City of Onkaparinga is:
- A smaller percentage of persons aged 25 to 29 (5.1% compared to 6.0%)
Emerging groups
From 2011 to 2021, Northern District's population increased by 651 people (1.6%). This represents an average annual population change of 0.16% per year over the period.
The largest changes in age structure in this area between 2011 and 2021 were in the age groups:
- 70 to 74 (+1,387 persons)
- 65 to 69 (+924 persons)
- 75 to 79 (+716 persons)
- 50 to 54 (-561 persons)
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