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 Kojonup (S), accounting for 18% (342 people). This share was lower than Regional WA (19.9%). Since 2016, the biggest change was in Young workforce (25 to 34), which decreased by 54 people and 2.4 percentage points.
Section overview
Age structure - Service age groups
Kojonup (S) - Total persons (Usual residence)
This table summarises service age groups for Kojonup (S) in 2021 for persons, with comparison against Regional WA and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Kojonup (S), with comparison markers for Regional WA.
Babies and pre-schoolers (0 to 4)
2021 count
109
% of total
5.7%
Change from 2016
-1.8pp
109
5.7%
-1.8pp
Primary schoolers (5 to 11)
2021 count
209
% of total
11.0%
Change from 2016
0.0pp
209
11.0%
0.0pp
Secondary schoolers (12 to 17)
2021 count
89
% of total
4.7%
Change from 2016
+1.0pp
89
4.7%
+1.0pp
Tertiary education and independence (18 to 24)
2021 count
110
% of total
5.8%
Change from 2016
+0.7pp
110
5.8%
+0.7pp
Young workforce (25 to 34)
2021 count
170
% of total
8.9%
Change from 2016
-2.4pp
170
8.9%
-2.4pp
Parents and homebuilders (35 to 49)
2021 count
342
% of total
18.0%
Change from 2016
0.0pp
342
18.0%
0.0pp
Older workers and pre-retirees (50 to 59)
2021 count
298
% of total
15.7%
Change from 2016
+0.4pp
298
15.7%
+0.4pp
Empty nesters and retirees (60 to 69)
2021 count
269
% of total
14.2%
Change from 2016
+1.5pp
269
14.2%
+1.5pp
Seniors (70 to 84)
2021 count
245
% of total
12.9%
Change from 2016
+2.1pp
245
12.9%
+2.1pp
Elderly aged (85 and over)
2021 count
60
% of total
3.2%
Change from 2016
+0.3pp
60
3.2%
+0.3pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-39
-1.8pp
Primary schoolers (5 to 11)
-9
0.0pp
Secondary schoolers (12 to 17)
+16
+1.0pp
Tertiary education and independence (18 to 24)
+9
+0.7pp
Young workforce (25 to 34)
-54
-2.4pp
Parents and homebuilders (35 to 49)
-15
0.0pp
Older workers and pre-retirees (50 to 59)
-5
+0.4pp
Empty nesters and retirees (60 to 69)
+17
+1.5pp
Seniors (70 to 84)
+31
+2.1pp
Elderly aged (85 and over)
+2
+0.3pp
Data table
Service age groups for Kojonup (S). Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Regional WA.
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Regional WA% | Count | % | Regional WA% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 109 | 5.7% | 6.0% | 148 | 7.5% | 6.6% | -39 | -1.8pp |
| Primary schoolers (5 to 11) | 209 | 11.0% | 9.5% | 218 | 11.0% | 9.8% | -9 | 0.0pp |
| Secondary schoolers (12 to 17) | 89 | 4.7% | 7.6% | 73 | 3.7% | 7.4% | +16 | +1.0pp |
| Tertiary education and independence (18 to 24) | 110 | 5.8% | 6.7% | 101 | 5.1% | 7.0% | +9 | +0.7pp |
| Young workforce (25 to 34) | 170 | 8.9% | 12.5% | 224 | 11.3% | 13.6% | -54 | -2.4pp |
| Parents and homebuilders (35 to 49) | 342 | 18.0% | 19.9% | 357 | 18.0% | 20.8% | -15 | 0.0pp |
| Older workers and pre-retirees (50 to 59) | 298 | 15.7% | 13.7% | 303 | 15.3% | 14.1% | -5 | +0.4pp |
| Empty nesters and retirees (60 to 69) | 269 | 14.2% | 12.4% | 252 | 12.7% | 11.3% | +17 | +1.5pp |
| Seniors (70 to 84) | 245 | 12.9% | 10.1% | 214 | 10.8% | 7.8% | +31 | +2.1pp |
| Elderly aged (85 and over) | 60 | 3.2% | 1.7% | 58 | 2.9% | 1.5% | +2 | +0.3pp |
| Total | 1,901 | 100.0% | 100.0% | 1,985 | 100.0% | 100.0% | -84 | 0.0pp |