Population
Service age groups
About this topic
Service age groups divide the population into broad life-stage bands such as children, young adults, working-age adults, and older people. The groupings are designed to reflect typical demand for age-based services and facilities rather than exact five-year cohorts.
This view is useful for planning childcare, schools, recreation, aged services, and other community infrastructure. It works best alongside five year age groups, household type, and dwelling data, which add more detail about who is living in an area and how needs may change over time.
Interpretation notes
- This is a derived grouping rather than a direct Census question, so the age bands are planning-oriented summaries built from standard age data.
- Percentages relate to the total population; use five year age groups when exact cohort detail matters.
Related topics
Key insight
In 2021, Parents and homebuilders (35 to 49) was the most common category among residents in Aldinga, accounting for 19.6% (150 people). This share was higher than Onkaparinga (C) (19.2%). Since 2016, the biggest change was in Empty nesters and retirees (60 to 69), which increased by 63 people and 4.7 percentage points.
Section overview
Age structure - Service age groups
Aldinga - Total persons (Usual residence)
This table summarises service age groups for Aldinga in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Aldinga, with comparison markers for Onkaparinga (C).
Babies and pre-schoolers (0 to 4)
2021 count
33
% of total
4.3%
Change from 2016
-2.9pp
33
4.3%
-2.9pp
Primary schoolers (5 to 11)
2021 count
70
% of total
9.2%
Change from 2016
-0.6pp
70
9.2%
-0.6pp
Secondary schoolers (12 to 17)
2021 count
73
% of total
9.6%
Change from 2016
+2.8pp
73
9.6%
+2.8pp
Tertiary education and independence (18 to 24)
2021 count
31
% of total
4.1%
Change from 2016
+0.3pp
31
4.1%
+0.3pp
Young workforce (25 to 34)
2021 count
44
% of total
5.8%
Change from 2016
-2.8pp
44
5.8%
-2.8pp
Parents and homebuilders (35 to 49)
2021 count
150
% of total
19.6%
Change from 2016
-0.5pp
150
19.6%
-0.5pp
Older workers and pre-retirees (50 to 59)
2021 count
133
% of total
17.4%
Change from 2016
+4.3pp
133
17.4%
+4.3pp
Empty nesters and retirees (60 to 69)
2021 count
143
% of total
18.7%
Change from 2016
+4.7pp
143
18.7%
+4.7pp
Seniors (70 to 84)
2021 count
90
% of total
11.8%
Change from 2016
-1.3pp
90
11.8%
-1.3pp
Elderly aged (85 and over)
2021 count
9
% of total
1.2%
Change from 2016
+0.7pp
9
1.2%
+0.7pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-8
-2.9pp
Primary schoolers (5 to 11)
+14
-0.6pp
Secondary schoolers (12 to 17)
+34
+2.8pp
Tertiary education and independence (18 to 24)
+9
+0.3pp
Young workforce (25 to 34)
-5
-2.8pp
Parents and homebuilders (35 to 49)
+35
-0.5pp
Older workers and pre-retirees (50 to 59)
+58
+4.3pp
Empty nesters and retirees (60 to 69)
+63
+4.7pp
Seniors (70 to 84)
+15
-1.3pp
Elderly aged (85 and over)
+6
+0.7pp
Data table
Service age groups for Aldinga. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Onkaparinga (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Onkaparinga (C)% | Count | % | Onkaparinga (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 33 | 4.3% | 5.4% | 41 | 7.2% | 6.2% | -8 | -2.9pp |
| Primary schoolers (5 to 11) | 70 | 9.2% | 8.6% | 56 | 9.8% | 8.9% | +14 | -0.6pp |
| Secondary schoolers (12 to 17) | 73 | 9.6% | 7.3% | 39 | 6.8% | 7.5% | +34 | +2.8pp |
| Tertiary education and independence (18 to 24) | 31 | 4.1% | 7.9% | 22 | 3.8% | 8.4% | +9 | +0.3pp |
| Young workforce (25 to 34) | 44 | 5.8% | 12.2% | 49 | 8.6% | 12.4% | -5 | -2.8pp |
| Parents and homebuilders (35 to 49) | 150 | 19.6% | 19.2% | 115 | 20.1% | 19.7% | +35 | -0.5pp |
| Older workers and pre-retirees (50 to 59) | 133 | 17.4% | 13.1% | 75 | 13.1% | 13.3% | +58 | +4.3pp |
| Empty nesters and retirees (60 to 69) | 143 | 18.7% | 12.3% | 80 | 14.0% | 12.4% | +63 | +4.7pp |
| Seniors (70 to 84) | 90 | 11.8% | 11.8% | 75 | 13.1% | 9.1% | +15 | -1.3pp |
| Elderly aged (85 and over) | 9 | 1.2% | 2.2% | 3 | 0.5% | 2.1% | +6 | +0.7pp |
| Total | 764 | 100.0% | 100.0% | 573 | 100.0% | 100.0% | +191 | 0.0pp |