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 Mount Barker (DC), accounting for 19.6% (7,675 people). This share was similar to Greater Adelaide (19.6%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 1,323 people and 2.1 percentage points.
Section overview
Age structure - Service age groups
Mount Barker (DC) - Total persons (Usual residence)
This table summarises service age groups for Mount Barker (DC) in 2021 for persons, with comparison against Greater Adelaide and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Mount Barker (DC), with comparison markers for Greater Adelaide.
Babies and pre-schoolers (0 to 4)
2021 count
2,491
% of total
6.4%
Change from 2016
0.0pp
2,491
6.4%
0.0pp
Primary schoolers (5 to 11)
2021 count
3,558
% of total
9.1%
Change from 2016
-0.6pp
3,558
9.1%
-0.6pp
Secondary schoolers (12 to 17)
2021 count
3,068
% of total
7.8%
Change from 2016
-0.4pp
3,068
7.8%
-0.4pp
Tertiary education and independence (18 to 24)
2021 count
3,161
% of total
8.1%
Change from 2016
-0.3pp
3,161
8.1%
-0.3pp
Young workforce (25 to 34)
2021 count
4,922
% of total
12.6%
Change from 2016
+1.1pp
4,922
12.6%
+1.1pp
Parents and homebuilders (35 to 49)
2021 count
7,675
% of total
19.6%
Change from 2016
-1.1pp
7,675
19.6%
-1.1pp
Older workers and pre-retirees (50 to 59)
2021 count
5,113
% of total
13.0%
Change from 2016
-0.6pp
5,113
13.0%
-0.6pp
Empty nesters and retirees (60 to 69)
2021 count
4,510
% of total
11.5%
Change from 2016
0.0pp
4,510
11.5%
0.0pp
Seniors (70 to 84)
2021 count
4,015
% of total
10.2%
Change from 2016
+2.1pp
4,015
10.2%
+2.1pp
Elderly aged (85 and over)
2021 count
744
% of total
1.9%
Change from 2016
0.0pp
744
1.9%
0.0pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+343
0.0pp
Primary schoolers (5 to 11)
+316
-0.6pp
Secondary schoolers (12 to 17)
+329
-0.4pp
Tertiary education and independence (18 to 24)
+355
-0.3pp
Young workforce (25 to 34)
+1,079
+1.1pp
Parents and homebuilders (35 to 49)
+772
-1.1pp
Older workers and pre-retirees (50 to 59)
+575
-0.6pp
Empty nesters and retirees (60 to 69)
+682
0.0pp
Seniors (70 to 84)
+1,323
+2.1pp
Elderly aged (85 and over)
+121
0.0pp
Data table
Service age groups for Mount Barker (DC). Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Greater Adelaide.
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Greater Adelaide% | Count | % | Greater Adelaide% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 2,491 | 6.4% | 5.4% | 2,148 | 6.4% | 5.9% | +343 | 0.0pp |
| Primary schoolers (5 to 11) | 3,558 | 9.1% | 8.2% | 3,242 | 9.7% | 8.2% | +316 | -0.6pp |
| Secondary schoolers (12 to 17) | 3,068 | 7.8% | 6.9% | 2,739 | 8.2% | 6.9% | +329 | -0.4pp |
| Tertiary education and independence (18 to 24) | 3,161 | 8.1% | 8.8% | 2,806 | 8.4% | 9.5% | +355 | -0.3pp |
| Young workforce (25 to 34) | 4,922 | 12.6% | 14.0% | 3,843 | 11.5% | 13.8% | +1,079 | +1.1pp |
| Parents and homebuilders (35 to 49) | 7,675 | 19.6% | 19.6% | 6,903 | 20.7% | 19.7% | +772 | -1.1pp |
| Older workers and pre-retirees (50 to 59) | 5,113 | 13.0% | 12.6% | 4,538 | 13.6% | 13.1% | +575 | -0.6pp |
| Empty nesters and retirees (60 to 69) | 4,510 | 11.5% | 11.2% | 3,828 | 11.5% | 11.1% | +682 | 0.0pp |
| Seniors (70 to 84) | 4,015 | 10.2% | 10.7% | 2,692 | 8.1% | 9.3% | +1,323 | +2.1pp |
| Elderly aged (85 and over) | 744 | 1.9% | 2.6% | 623 | 1.9% | 2.6% | +121 | 0.0pp |
| Total | 39,217 | 100.0% | 100.0% | 33,397 | 100.0% | 100.0% | +5,820 | 0.0pp |