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LEARN MORE ABOUT .idIn 2021, the largest age group in South Australia was 35 to 39 year olds. The group that changed the most since 2011 was 70 to 74 year olds, increasing by 35,448 people.
The Age Structure of South Australia provides key insights into the level of demand for age based services and facilities such as child care. It is also an indicator of South Australia'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 South Australia'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 | |||||||
|---|---|---|---|---|---|---|---|
| South Australia - Total persons (Usual residence) | 2021 | 2011 | Change | ||||
| Five year age groups (years) | Number | % | Victoria % | Number | % | Victoria % | 2011 to 2021 |
| 0 to 4 | 94,232 | 5.3 | 5.8 | 96,199 | 6.0 | 6.4 | -1,967 |
| 5 to 9 | 103,750 | 5.8 | 6.2 | 93,167 | 5.8 | 6.1 | +10,583 |
| 10 to 14 | 105,159 | 5.9 | 6.0 | 97,664 | 6.1 | 6.1 | +7,495 |
| 15 to 19 | 99,152 | 5.6 | 5.6 | 103,260 | 6.5 | 6.4 | -4,108 |
| 20 to 24 | 109,174 | 6.1 | 6.3 | 105,547 | 6.6 | 7.0 | +3,627 |
| 25 to 29 | 117,195 | 6.6 | 7.3 | 104,414 | 6.5 | 7.3 | +12,781 |
| 30 to 34 | 118,095 | 6.6 | 7.7 | 97,762 | 6.1 | 7.0 | +20,333 |
| 35 to 39 | 118,993 | 6.7 | 7.5 | 103,883 | 6.5 | 7.2 | +15,110 |
| 40 to 44 | 107,667 | 6.0 | 6.6 | 112,431 | 7.0 | 7.3 | -4,764 |
| 45 to 49 | 109,716 | 6.2 | 6.4 | 113,091 | 7.1 | 7.0 | -3,375 |
| 50 to 54 | 114,921 | 6.5 | 6.3 | 111,829 | 7.0 | 6.6 | +3,092 |
| 55 to 59 | 114,300 | 6.4 | 5.9 | 102,021 | 6.4 | 5.9 | +12,279 |
| 60 to 64 | 112,846 | 6.3 | 5.6 | 97,551 | 6.1 | 5.5 | +15,295 |
| 65 to 69 | 102,304 | 5.7 | 4.9 | 74,593 | 4.7 | 4.2 | +27,711 |
| 70 to 74 | 94,040 | 5.3 | 4.4 | 58,592 | 3.7 | 3.3 | +35,448 |
| 75 to 79 | 66,986 | 3.8 | 3.1 | 46,634 | 2.9 | 2.6 | +20,352 |
| 80 to 84 | 45,666 | 2.6 | 2.2 | 39,589 | 2.5 | 2.1 | +6,077 |
| 85 and over | 47,325 | 2.7 | 2.2 | 38,361 | 2.4 | 2.0 | +8,964 |
| Total population | 1,781,521 | 100.0 | 100.0 | 1,596,588 | 100.0 | 100.0 | +184,933 |
Dominant groups
Analysis of the five year age groups of South Australia in 2021 compared to Victoria 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, 17.0% of the population was aged between 0 and 15, and 20.0% were aged 65 years and over, compared with 18.0% and 16.8% respectively for Victoria.
The major differences between the age structure of South Australia and Victoria were:
- A larger percentage of persons aged 70 to 74 (5.3% compared to 4.4%)
- A larger percentage of persons aged 65 to 69 (5.7% compared to 4.9%)
- A smaller percentage of persons aged 30 to 34 (6.6% compared to 7.7%)
- A smaller percentage of persons aged 35 to 39 (6.7% compared to 7.5%)
Emerging groups
From 2011 to 2021, South Australia's population increased by 184,933 people (11.6%). This represents an average annual population change of 1.1% 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 (+35,448 persons)
- 65 to 69 (+27,711 persons)
- 75 to 79 (+20,352 persons)
- 30 to 34 (+20,333 persons)
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