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 Perenjori (S), accounting for 23.5% (148 people). This share was higher than Regional WA (19.9%). Since 2016, the biggest change was in Young workforce (25 to 34), which decreased by 40 people and 6.8 percentage points.
Section overview
Age structure - Service age groups
Perenjori (S) - Total persons (Usual residence)
This table summarises service age groups for Perenjori (S) in 2021 for persons, with comparison against Regional WA and change since 2016.
Chart view
Age structure - Service age groups snapshot
2021 distribution by category for Perenjori (S), with comparison markers for Regional WA.
Babies and pre-schoolers (0 to 4)
2021 count
23
% of total
3.7%
Change from 2016
-0.2pp
23
3.7%
-0.2pp
Primary schoolers (5 to 11)
2021 count
72
% of total
11.4%
Change from 2016
+3.9pp
72
11.4%
+3.9pp
Secondary schoolers (12 to 17)
2021 count
16
% of total
2.5%
Change from 2016
+0.4pp
16
2.5%
+0.4pp
Tertiary education and independence (18 to 24)
2021 count
39
% of total
6.2%
Change from 2016
-0.6pp
39
6.2%
-0.6pp
Young workforce (25 to 34)
2021 count
77
% of total
12.2%
Change from 2016
-6.8pp
77
12.2%
-6.8pp
Parents and homebuilders (35 to 49)
2021 count
148
% of total
23.5%
Change from 2016
+0.5pp
148
23.5%
+0.5pp
Older workers and pre-retirees (50 to 59)
2021 count
111
% of total
17.6%
Change from 2016
-0.4pp
111
17.6%
-0.4pp
Empty nesters and retirees (60 to 69)
2021 count
87
% of total
13.8%
Change from 2016
+1.3pp
87
13.8%
+1.3pp
Seniors (70 to 84)
2021 count
47
% of total
7.5%
Change from 2016
+3.6pp
47
7.5%
+3.6pp
Elderly aged (85 and over)
2021 count
12
% of total
1.9%
Change from 2016
+0.1pp
12
1.9%
+0.1pp
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-1
-0.2pp
Primary schoolers (5 to 11)
+26
+3.9pp
Secondary schoolers (12 to 17)
+3
+0.4pp
Tertiary education and independence (18 to 24)
-3
-0.6pp
Young workforce (25 to 34)
-40
-6.8pp
Parents and homebuilders (35 to 49)
+6
+0.5pp
Older workers and pre-retirees (50 to 59)
0
-0.4pp
Empty nesters and retirees (60 to 69)
+10
+1.3pp
Seniors (70 to 84)
+23
+3.6pp
Elderly aged (85 and over)
+1
+0.1pp
Data table
Service age groups for Perenjori (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) | 23 | 3.7% | 6.0% | 24 | 3.9% | 6.6% | -1 | -0.2pp |
| Primary schoolers (5 to 11) | 72 | 11.4% | 9.5% | 46 | 7.5% | 9.8% | +26 | +3.9pp |
| Secondary schoolers (12 to 17) | 16 | 2.5% | 7.6% | 13 | 2.1% | 7.4% | +3 | +0.4pp |
| Tertiary education and independence (18 to 24) | 39 | 6.2% | 6.7% | 42 | 6.8% | 7.0% | -3 | -0.6pp |
| Young workforce (25 to 34) | 77 | 12.2% | 12.5% | 117 | 19.0% | 13.6% | -40 | -6.8pp |
| Parents and homebuilders (35 to 49) | 148 | 23.5% | 19.9% | 142 | 23.0% | 20.8% | +6 | +0.5pp |
| Older workers and pre-retirees (50 to 59) | 111 | 17.6% | 13.7% | 111 | 18.0% | 14.1% | 0 | -0.4pp |
| Empty nesters and retirees (60 to 69) | 87 | 13.8% | 12.4% | 77 | 12.5% | 11.3% | +10 | +1.3pp |
| Seniors (70 to 84) | 47 | 7.5% | 10.1% | 24 | 3.9% | 7.8% | +23 | +3.6pp |
| Elderly aged (85 and over) | 12 | 1.9% | 1.7% | 11 | 1.8% | 1.5% | +1 | +0.1pp |
| Total | 629 | 100.0% | 100.0% | 617 | 100.0% | 100.0% | +12 | 0.0pp |