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, Older workers and pre-retirees (50 to 59) was the most common category among residents in Kojonup, accounting for 17% (197 people). This share was higher than Kojonup (S) (15.7%). Since 2016, the biggest change was in Babies and pre-schoolers (0 to 4), which decreased by 43 people and 2.7 percentage points.
Section overview
Age structure - Service age groups
Kojonup - Total persons (Usual residence)
This table summarises service age groups for Kojonup in 2021 for persons, with comparison against Kojonup (S) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Kojonup, with comparison markers for Kojonup (S).
Babies and pre-schoolers (0 to 4)
2021 count
61
% of total
5.3%
Change from 2016
-2.7pp
61
5.3%
-2.7pp
Primary schoolers (5 to 11)
2021 count
121
% of total
10.5%
Change from 2016
+1.1pp
121
10.5%
+1.1pp
Secondary schoolers (12 to 17)
2021 count
57
% of total
4.9%
Change from 2016
+0.7pp
57
4.9%
+0.7pp
Tertiary education and independence (18 to 24)
2021 count
50
% of total
4.3%
Change from 2016
-1.6pp
50
4.3%
-1.6pp
Young workforce (25 to 34)
2021 count
115
% of total
9.9%
Change from 2016
-1.0pp
115
9.9%
-1.0pp
Parents and homebuilders (35 to 49)
2021 count
194
% of total
16.8%
Change from 2016
+0.6pp
194
16.8%
+0.6pp
Older workers and pre-retirees (50 to 59)
2021 count
197
% of total
17.0%
Change from 2016
+0.5pp
197
17.0%
+0.5pp
Empty nesters and retirees (60 to 69)
2021 count
154
% of total
13.3%
Change from 2016
0.0pp
154
13.3%
0.0pp
Seniors (70 to 84)
2021 count
161
% of total
13.9%
Change from 2016
+2.7pp
161
13.9%
+2.7pp
Elderly aged (85 and over)
2021 count
48
% of total
4.1%
Change from 2016
0.0pp
48
4.1%
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)
-43
-2.7pp
Primary schoolers (5 to 11)
-1
+1.1pp
Secondary schoolers (12 to 17)
+3
+0.7pp
Tertiary education and independence (18 to 24)
-26
-1.6pp
Young workforce (25 to 34)
-26
-1.0pp
Parents and homebuilders (35 to 49)
-16
+0.6pp
Older workers and pre-retirees (50 to 59)
-17
+0.5pp
Empty nesters and retirees (60 to 69)
-19
0.0pp
Seniors (70 to 84)
+16
+2.7pp
Elderly aged (85 and over)
-5
0.0pp
Data table
Service age groups for Kojonup. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Kojonup (S).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Kojonup (S)% | Count | % | Kojonup (S)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 61 | 5.3% | 5.7% | 104 | 8.0% | 7.5% | -43 | -2.7pp |
| Primary schoolers (5 to 11) | 121 | 10.5% | 11.0% | 122 | 9.4% | 11.0% | -1 | +1.1pp |
| Secondary schoolers (12 to 17) | 57 | 4.9% | 4.7% | 54 | 4.2% | 3.7% | +3 | +0.7pp |
| Tertiary education and independence (18 to 24) | 50 | 4.3% | 5.8% | 76 | 5.9% | 5.1% | -26 | -1.6pp |
| Young workforce (25 to 34) | 115 | 9.9% | 8.9% | 141 | 10.9% | 11.3% | -26 | -1.0pp |
| Parents and homebuilders (35 to 49) | 194 | 16.8% | 18.0% | 210 | 16.2% | 18.0% | -16 | +0.6pp |
| Older workers and pre-retirees (50 to 59) | 197 | 17.0% | 15.7% | 214 | 16.5% | 15.3% | -17 | +0.5pp |
| Empty nesters and retirees (60 to 69) | 154 | 13.3% | 14.2% | 173 | 13.3% | 12.7% | -19 | 0.0pp |
| Seniors (70 to 84) | 161 | 13.9% | 12.9% | 145 | 11.2% | 10.8% | +16 | +2.7pp |
| Elderly aged (85 and over) | 48 | 4.1% | 3.2% | 53 | 4.1% | 2.9% | -5 | 0.0pp |
| Total | 1,157 | 100.0% | 100.0% | 1,298 | 100.0% | 100.0% | -141 | 0.0pp |