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 Hallett Cove, accounting for 20.3% (2,539 people). This share was similar to Marion (C) (20.2%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 446 people and 3.5 percentage points.
Section overview
Age structure - Service age groups
Hallett Cove - Total persons (Usual residence)
This table summarises service age groups for Hallett Cove in 2021 for persons, with comparison against Marion (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Hallett Cove, with comparison markers for Marion (C).
Babies and pre-schoolers (0 to 4)
2021 count
610
% of total
4.9%
Change from 2016
-0.6pp
610
4.9%
-0.6pp
Primary schoolers (5 to 11)
2021 count
990
% of total
7.9%
Change from 2016
-0.4pp
990
7.9%
-0.4pp
Secondary schoolers (12 to 17)
2021 count
877
% of total
7.0%
Change from 2016
-0.6pp
877
7.0%
-0.6pp
Tertiary education and independence (18 to 24)
2021 count
975
% of total
7.8%
Change from 2016
-0.9pp
975
7.8%
-0.9pp
Young workforce (25 to 34)
2021 count
1,314
% of total
10.5%
Change from 2016
+0.1pp
1,314
10.5%
+0.1pp
Parents and homebuilders (35 to 49)
2021 count
2,539
% of total
20.3%
Change from 2016
-0.4pp
2,539
20.3%
-0.4pp
Older workers and pre-retirees (50 to 59)
2021 count
1,801
% of total
14.4%
Change from 2016
-2.3pp
1,801
14.4%
-2.3pp
Empty nesters and retirees (60 to 69)
2021 count
1,965
% of total
15.7%
Change from 2016
+1.8pp
1,965
15.7%
+1.8pp
Seniors (70 to 84)
2021 count
1,287
% of total
10.3%
Change from 2016
+3.5pp
1,287
10.3%
+3.5pp
Elderly aged (85 and over)
2021 count
170
% of total
1.4%
Change from 2016
+0.2pp
170
1.4%
+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)
-64
-0.6pp
Primary schoolers (5 to 11)
-33
-0.4pp
Secondary schoolers (12 to 17)
-54
-0.6pp
Tertiary education and independence (18 to 24)
-99
-0.9pp
Young workforce (25 to 34)
+33
+0.1pp
Parents and homebuilders (35 to 49)
-10
-0.4pp
Older workers and pre-retirees (50 to 59)
-254
-2.3pp
Empty nesters and retirees (60 to 69)
+251
+1.8pp
Seniors (70 to 84)
+446
+3.5pp
Elderly aged (85 and over)
+20
+0.2pp
Data table
Service age groups for Hallett Cove. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Marion (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Marion (C)% | Count | % | Marion (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 610 | 4.9% | 5.4% | 674 | 5.5% | 5.9% | -64 | -0.6pp |
| Primary schoolers (5 to 11) | 990 | 7.9% | 7.7% | 1,023 | 8.3% | 7.4% | -33 | -0.4pp |
| Secondary schoolers (12 to 17) | 877 | 7.0% | 6.1% | 931 | 7.6% | 6.1% | -54 | -0.6pp |
| Tertiary education and independence (18 to 24) | 975 | 7.8% | 8.8% | 1,074 | 8.7% | 9.6% | -99 | -0.9pp |
| Young workforce (25 to 34) | 1,314 | 10.5% | 15.1% | 1,281 | 10.4% | 14.8% | +33 | +0.1pp |
| Parents and homebuilders (35 to 49) | 2,539 | 20.3% | 20.2% | 2,549 | 20.7% | 19.5% | -10 | -0.4pp |
| Older workers and pre-retirees (50 to 59) | 1,801 | 14.4% | 11.7% | 2,055 | 16.7% | 13.0% | -254 | -2.3pp |
| Empty nesters and retirees (60 to 69) | 1,965 | 15.7% | 11.8% | 1,714 | 13.9% | 11.4% | +251 | +1.8pp |
| Seniors (70 to 84) | 1,287 | 10.3% | 10.4% | 841 | 6.8% | 9.1% | +446 | +3.5pp |
| Elderly aged (85 and over) | 170 | 1.4% | 2.9% | 150 | 1.2% | 3.1% | +20 | +0.2pp |
| Total | 12,512 | 100.0% | 100.0% | 12,301 | 100.0% | 100.0% | +211 | 0.0pp |