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 Blakiston, accounting for 19.1% (72 people). This share was lower than Mount Barker (DC) (19.6%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which increased by 39 people and 8.4 percentage points.
Section overview
Age structure - Service age groups
Blakiston - Total persons (Usual residence)
This table summarises service age groups for Blakiston in 2021 for persons, with comparison against Mount Barker (DC) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Blakiston, with comparison markers for Mount Barker (DC).
Babies and pre-schoolers (0 to 4)
2021 count
19
% of total
5.0%
Change from 2016
-3.8pp
19
5.0%
-3.8pp
Primary schoolers (5 to 11)
2021 count
26
% of total
6.9%
Change from 2016
+4.6pp
26
6.9%
+4.6pp
Secondary schoolers (12 to 17)
2021 count
36
% of total
9.5%
Change from 2016
+4.9pp
36
9.5%
+4.9pp
Tertiary education and independence (18 to 24)
2021 count
38
% of total
10.1%
Change from 2016
+6.8pp
38
10.1%
+6.8pp
Young workforce (25 to 34)
2021 count
10
% of total
2.7%
Change from 2016
-8.4pp
10
2.7%
-8.4pp
Parents and homebuilders (35 to 49)
2021 count
72
% of total
19.1%
Change from 2016
+8.4pp
72
19.1%
+8.4pp
Older workers and pre-retirees (50 to 59)
2021 count
62
% of total
16.4%
Change from 2016
-5.7pp
62
16.4%
-5.7pp
Empty nesters and retirees (60 to 69)
2021 count
51
% of total
13.5%
Change from 2016
-8.0pp
51
13.5%
-8.0pp
Seniors (70 to 84)
2021 count
49
% of total
13.0%
Change from 2016
-1.3pp
49
13.0%
-1.3pp
Elderly aged (85 and over)
2021 count
5
% of total
1.3%
Change from 2016
-1.0pp
5
1.3%
-1.0pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-8
-3.8pp
Primary schoolers (5 to 11)
+19
+4.6pp
Secondary schoolers (12 to 17)
+22
+4.9pp
Tertiary education and independence (18 to 24)
+28
+6.8pp
Young workforce (25 to 34)
-24
-8.4pp
Parents and homebuilders (35 to 49)
+39
+8.4pp
Older workers and pre-retirees (50 to 59)
-6
-5.7pp
Empty nesters and retirees (60 to 69)
-15
-8.0pp
Seniors (70 to 84)
+5
-1.3pp
Elderly aged (85 and over)
-2
-1.0pp
Data table
Service age groups for Blakiston. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Mount Barker (DC).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Mount Barker (DC)% | Count | % | Mount Barker (DC)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 19 | 5.0% | 6.4% | 27 | 8.8% | 6.4% | -8 | -3.8pp |
| Primary schoolers (5 to 11) | 26 | 6.9% | 9.1% | 7 | 2.3% | 9.7% | +19 | +4.6pp |
| Secondary schoolers (12 to 17) | 36 | 9.5% | 7.8% | 14 | 4.6% | 8.2% | +22 | +4.9pp |
| Tertiary education and independence (18 to 24) | 38 | 10.1% | 8.1% | 10 | 3.3% | 8.4% | +28 | +6.8pp |
| Young workforce (25 to 34) | 10 | 2.7% | 12.6% | 34 | 11.1% | 11.5% | -24 | -8.4pp |
| Parents and homebuilders (35 to 49) | 72 | 19.1% | 19.6% | 33 | 10.7% | 20.7% | +39 | +8.4pp |
| Older workers and pre-retirees (50 to 59) | 62 | 16.4% | 13.0% | 68 | 22.1% | 13.6% | -6 | -5.7pp |
| Empty nesters and retirees (60 to 69) | 51 | 13.5% | 11.5% | 66 | 21.5% | 11.5% | -15 | -8.0pp |
| Seniors (70 to 84) | 49 | 13.0% | 10.2% | 44 | 14.3% | 8.1% | +5 | -1.3pp |
| Elderly aged (85 and over) | 5 | 1.3% | 1.9% | 7 | 2.3% | 1.9% | -2 | -1.0pp |
| Total | 377 | 100.0% | 100.0% | 307 | 100.0% | 100.0% | +70 | 0.0pp |