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 Koorda (S), accounting for 21.1% (76 people). This share was higher than Regional WA (19.9%). Since 2016, the biggest change was in Older workers and pre-retirees (50 to 59), which decreased by 15 people and 1.6 percentage points.
Section overview
Age structure - Service age groups
Koorda (S) - Total persons (Usual residence)
This table summarises service age groups for Koorda (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 Koorda (S), with comparison markers for Regional WA.
Babies and pre-schoolers (0 to 4)
2021 count
21
% of total
5.8%
Change from 2016
-1.7pp
21
5.8%
-1.7pp
Primary schoolers (5 to 11)
2021 count
51
% of total
14.1%
Change from 2016
+3.5pp
51
14.1%
+3.5pp
Secondary schoolers (12 to 17)
2021 count
4
% of total
1.1%
Change from 2016
-0.3pp
4
1.1%
-0.3pp
Tertiary education and independence (18 to 24)
2021 count
17
% of total
4.7%
Change from 2016
+0.8pp
17
4.7%
+0.8pp
Young workforce (25 to 34)
2021 count
43
% of total
11.9%
Change from 2016
+3.0pp
43
11.9%
+3.0pp
Parents and homebuilders (35 to 49)
2021 count
76
% of total
21.1%
Change from 2016
+1.8pp
76
21.1%
+1.8pp
Older workers and pre-retirees (50 to 59)
2021 count
57
% of total
15.8%
Change from 2016
-1.6pp
57
15.8%
-1.6pp
Empty nesters and retirees (60 to 69)
2021 count
71
% of total
19.7%
Change from 2016
+4.7pp
71
19.7%
+4.7pp
Seniors (70 to 84)
2021 count
49
% of total
13.6%
Change from 2016
+3.9pp
49
13.6%
+3.9pp
Elderly aged (85 and over)
2021 count
6
% of total
1.7%
Change from 2016
0.0pp
6
1.7%
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)
-10
-1.7pp
Primary schoolers (5 to 11)
+7
+3.5pp
Secondary schoolers (12 to 17)
-2
-0.3pp
Tertiary education and independence (18 to 24)
+1
+0.8pp
Young workforce (25 to 34)
+6
+3.0pp
Parents and homebuilders (35 to 49)
-4
+1.8pp
Older workers and pre-retirees (50 to 59)
-15
-1.6pp
Empty nesters and retirees (60 to 69)
+9
+4.7pp
Seniors (70 to 84)
+9
+3.9pp
Elderly aged (85 and over)
-1
0.0pp
Data table
Service age groups for Koorda (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) | 21 | 5.8% | 6.0% | 31 | 7.5% | 6.6% | -10 | -1.7pp |
| Primary schoolers (5 to 11) | 51 | 14.1% | 9.5% | 44 | 10.6% | 9.8% | +7 | +3.5pp |
| Secondary schoolers (12 to 17) | 4 | 1.1% | 7.6% | 6 | 1.4% | 7.4% | -2 | -0.3pp |
| Tertiary education and independence (18 to 24) | 17 | 4.7% | 6.7% | 16 | 3.9% | 7.0% | +1 | +0.8pp |
| Young workforce (25 to 34) | 43 | 11.9% | 12.5% | 37 | 8.9% | 13.6% | +6 | +3.0pp |
| Parents and homebuilders (35 to 49) | 76 | 21.1% | 19.9% | 80 | 19.3% | 20.8% | -4 | +1.8pp |
| Older workers and pre-retirees (50 to 59) | 57 | 15.8% | 13.7% | 72 | 17.4% | 14.1% | -15 | -1.6pp |
| Empty nesters and retirees (60 to 69) | 71 | 19.7% | 12.4% | 62 | 15.0% | 11.3% | +9 | +4.7pp |
| Seniors (70 to 84) | 49 | 13.6% | 10.1% | 40 | 9.7% | 7.8% | +9 | +3.9pp |
| Elderly aged (85 and over) | 6 | 1.7% | 1.7% | 7 | 1.7% | 1.5% | -1 | 0.0pp |
| Total | 361 | 100.0% | 100.0% | 414 | 100.0% | 100.0% | -53 | 0.0pp |