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 O'Halloran Hill (part), accounting for 19.5% (530 people). This share was higher than Onkaparinga (C) (19.2%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which increased by 245 people, while its share fell by 0.2 percentage points.
Section overview
Age structure - Service age groups
O'Halloran Hill (part) - Total persons (Usual residence)
This table summarises service age groups for O'Halloran Hill (part) in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for O'Halloran Hill (part), with comparison markers for Onkaparinga (C).
Babies and pre-schoolers (0 to 4)
2021 count
144
% of total
5.3%
Change from 2016
-2.0pp
144
5.3%
-2.0pp
Primary schoolers (5 to 11)
2021 count
227
% of total
8.3%
Change from 2016
-2.2pp
227
8.3%
-2.2pp
Secondary schoolers (12 to 17)
2021 count
185
% of total
6.8%
Change from 2016
+0.9pp
185
6.8%
+0.9pp
Tertiary education and independence (18 to 24)
2021 count
185
% of total
6.8%
Change from 2016
-1.1pp
185
6.8%
-1.1pp
Young workforce (25 to 34)
2021 count
404
% of total
14.8%
Change from 2016
+2.1pp
404
14.8%
+2.1pp
Parents and homebuilders (35 to 49)
2021 count
530
% of total
19.5%
Change from 2016
-0.2pp
530
19.5%
-0.2pp
Older workers and pre-retirees (50 to 59)
2021 count
348
% of total
12.8%
Change from 2016
-1.3pp
348
12.8%
-1.3pp
Empty nesters and retirees (60 to 69)
2021 count
295
% of total
10.8%
Change from 2016
-3.1pp
295
10.8%
-3.1pp
Seniors (70 to 84)
2021 count
336
% of total
12.3%
Change from 2016
+3.9pp
336
12.3%
+3.9pp
Elderly aged (85 and over)
2021 count
24
% of total
0.9%
Change from 2016
-0.2pp
24
0.9%
-0.2pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+38
-2.0pp
Primary schoolers (5 to 11)
+75
-2.2pp
Secondary schoolers (12 to 17)
+99
+0.9pp
Tertiary education and independence (18 to 24)
+70
-1.1pp
Young workforce (25 to 34)
+220
+2.1pp
Parents and homebuilders (35 to 49)
+245
-0.2pp
Older workers and pre-retirees (50 to 59)
+143
-1.3pp
Empty nesters and retirees (60 to 69)
+94
-3.1pp
Seniors (70 to 84)
+215
+3.9pp
Elderly aged (85 and over)
+8
-0.2pp
Data table
Service age groups for O'Halloran Hill (part). 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) | 144 | 5.3% | 5.4% | 106 | 7.3% | 6.2% | +38 | -2.0pp |
| Primary schoolers (5 to 11) | 227 | 8.3% | 8.6% | 152 | 10.5% | 8.9% | +75 | -2.2pp |
| Secondary schoolers (12 to 17) | 185 | 6.8% | 7.3% | 86 | 5.9% | 7.5% | +99 | +0.9pp |
| Tertiary education and independence (18 to 24) | 185 | 6.8% | 7.9% | 115 | 7.9% | 8.4% | +70 | -1.1pp |
| Young workforce (25 to 34) | 404 | 14.8% | 12.2% | 184 | 12.7% | 12.4% | +220 | +2.1pp |
| Parents and homebuilders (35 to 49) | 530 | 19.5% | 19.2% | 285 | 19.7% | 19.7% | +245 | -0.2pp |
| Older workers and pre-retirees (50 to 59) | 348 | 12.8% | 13.1% | 205 | 14.1% | 13.3% | +143 | -1.3pp |
| Empty nesters and retirees (60 to 69) | 295 | 10.8% | 12.3% | 201 | 13.9% | 12.4% | +94 | -3.1pp |
| Seniors (70 to 84) | 336 | 12.3% | 11.8% | 121 | 8.4% | 9.1% | +215 | +3.9pp |
| Elderly aged (85 and over) | 24 | 0.9% | 2.2% | 16 | 1.1% | 2.1% | +8 | -0.2pp |
| Total | 2,722 | 100.0% | 100.0% | 1,449 | 100.0% | 100.0% | +1,273 | 0.0pp |