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 Onkaparinga Hills, accounting for 18.3% (477 people). This share was lower than Onkaparinga (C) (19.2%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 105 people and 3.8 percentage points.
Section overview
Age structure - Service age groups
Onkaparinga Hills - Total persons (Usual residence)
This table summarises service age groups for Onkaparinga Hills in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Onkaparinga Hills, with comparison markers for Onkaparinga (C).
Babies and pre-schoolers (0 to 4)
2021 count
103
% of total
3.9%
Change from 2016
+0.4pp
103
3.9%
+0.4pp
Primary schoolers (5 to 11)
2021 count
217
% of total
8.3%
Change from 2016
-0.4pp
217
8.3%
-0.4pp
Secondary schoolers (12 to 17)
2021 count
227
% of total
8.7%
Change from 2016
-1.2pp
227
8.7%
-1.2pp
Tertiary education and independence (18 to 24)
2021 count
232
% of total
8.9%
Change from 2016
-0.7pp
232
8.9%
-0.7pp
Young workforce (25 to 34)
2021 count
234
% of total
9.0%
Change from 2016
+0.7pp
234
9.0%
+0.7pp
Parents and homebuilders (35 to 49)
2021 count
477
% of total
18.3%
Change from 2016
-3.5pp
477
18.3%
-3.5pp
Older workers and pre-retirees (50 to 59)
2021 count
455
% of total
17.4%
Change from 2016
-1.3pp
455
17.4%
-1.3pp
Empty nesters and retirees (60 to 69)
2021 count
387
% of total
14.8%
Change from 2016
+0.8pp
387
14.8%
+0.8pp
Seniors (70 to 84)
2021 count
279
% of total
10.7%
Change from 2016
+3.8pp
279
10.7%
+3.8pp
Elderly aged (85 and over)
2021 count
15
% of total
0.6%
Change from 2016
+0.1pp
15
0.6%
+0.1pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+14
+0.4pp
Primary schoolers (5 to 11)
-4
-0.4pp
Secondary schoolers (12 to 17)
-24
-1.2pp
Tertiary education and independence (18 to 24)
-10
-0.7pp
Young workforce (25 to 34)
+23
+0.7pp
Parents and homebuilders (35 to 49)
-74
-3.5pp
Older workers and pre-retirees (50 to 59)
-17
-1.3pp
Empty nesters and retirees (60 to 69)
+34
+0.8pp
Seniors (70 to 84)
+105
+3.8pp
Elderly aged (85 and over)
+3
+0.1pp
Data table
Service age groups for Onkaparinga Hills. 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) | 103 | 3.9% | 5.4% | 89 | 3.5% | 6.2% | +14 | +0.4pp |
| Primary schoolers (5 to 11) | 217 | 8.3% | 8.6% | 221 | 8.7% | 8.9% | -4 | -0.4pp |
| Secondary schoolers (12 to 17) | 227 | 8.7% | 7.3% | 251 | 9.9% | 7.5% | -24 | -1.2pp |
| Tertiary education and independence (18 to 24) | 232 | 8.9% | 7.9% | 242 | 9.6% | 8.4% | -10 | -0.7pp |
| Young workforce (25 to 34) | 234 | 9.0% | 12.2% | 211 | 8.3% | 12.4% | +23 | +0.7pp |
| Parents and homebuilders (35 to 49) | 477 | 18.3% | 19.2% | 551 | 21.8% | 19.7% | -74 | -3.5pp |
| Older workers and pre-retirees (50 to 59) | 455 | 17.4% | 13.1% | 472 | 18.7% | 13.3% | -17 | -1.3pp |
| Empty nesters and retirees (60 to 69) | 387 | 14.8% | 12.3% | 353 | 14.0% | 12.4% | +34 | +0.8pp |
| Seniors (70 to 84) | 279 | 10.7% | 11.8% | 174 | 6.9% | 9.1% | +105 | +3.8pp |
| Elderly aged (85 and over) | 15 | 0.6% | 2.2% | 12 | 0.5% | 2.1% | +3 | +0.1pp |
| Total | 2,610 | 100.0% | 100.0% | 2,530 | 100.0% | 100.0% | +80 | 0.0pp |