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 Mount Marshall (S), accounting for 22.2% (102 people). This share was higher than Regional WA (19.9%). Since 2016, the biggest change was in Primary schoolers (5 to 11), which decreased by 29 people and 4.8 percentage points.
Section overview
Age structure - Service age groups
Mount Marshall (S) - Total persons (Usual residence)
This table summarises service age groups for Mount Marshall (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 Mount Marshall (S), with comparison markers for Regional WA.
Babies and pre-schoolers (0 to 4)
2021 count
39
% of total
8.5%
Change from 2016
-0.2pp
39
8.5%
-0.2pp
Primary schoolers (5 to 11)
2021 count
25
% of total
5.4%
Change from 2016
-4.8pp
25
5.4%
-4.8pp
Secondary schoolers (12 to 17)
2021 count
3
% of total
0.7%
Change from 2016
-1.8pp
3
0.7%
-1.8pp
Tertiary education and independence (18 to 24)
2021 count
21
% of total
4.6%
Change from 2016
+1.4pp
21
4.6%
+1.4pp
Young workforce (25 to 34)
2021 count
47
% of total
10.2%
Change from 2016
-3.5pp
47
10.2%
-3.5pp
Parents and homebuilders (35 to 49)
2021 count
102
% of total
22.2%
Change from 2016
0.0pp
102
22.2%
0.0pp
Older workers and pre-retirees (50 to 59)
2021 count
88
% of total
19.2%
Change from 2016
+3.3pp
88
19.2%
+3.3pp
Empty nesters and retirees (60 to 69)
2021 count
81
% of total
17.6%
Change from 2016
+3.7pp
81
17.6%
+3.7pp
Seniors (70 to 84)
2021 count
33
% of total
7.2%
Change from 2016
-0.8pp
33
7.2%
-0.8pp
Elderly aged (85 and over)
2021 count
17
% of total
3.7%
Change from 2016
+2.6pp
17
3.7%
+2.6pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-7
-0.2pp
Primary schoolers (5 to 11)
-29
-4.8pp
Secondary schoolers (12 to 17)
-10
-1.8pp
Tertiary education and independence (18 to 24)
+4
+1.4pp
Young workforce (25 to 34)
-25
-3.5pp
Parents and homebuilders (35 to 49)
-15
0.0pp
Older workers and pre-retirees (50 to 59)
+4
+3.3pp
Empty nesters and retirees (60 to 69)
+8
+3.7pp
Seniors (70 to 84)
-9
-0.8pp
Elderly aged (85 and over)
+11
+2.6pp
Data table
Service age groups for Mount Marshall (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) | 39 | 8.5% | 6.0% | 46 | 8.7% | 6.6% | -7 | -0.2pp |
| Primary schoolers (5 to 11) | 25 | 5.4% | 9.5% | 54 | 10.2% | 9.8% | -29 | -4.8pp |
| Secondary schoolers (12 to 17) | 3 | 0.7% | 7.6% | 13 | 2.5% | 7.4% | -10 | -1.8pp |
| Tertiary education and independence (18 to 24) | 21 | 4.6% | 6.7% | 17 | 3.2% | 7.0% | +4 | +1.4pp |
| Young workforce (25 to 34) | 47 | 10.2% | 12.5% | 72 | 13.7% | 13.6% | -25 | -3.5pp |
| Parents and homebuilders (35 to 49) | 102 | 22.2% | 19.9% | 117 | 22.2% | 20.8% | -15 | 0.0pp |
| Older workers and pre-retirees (50 to 59) | 88 | 19.2% | 13.7% | 84 | 15.9% | 14.1% | +4 | +3.3pp |
| Empty nesters and retirees (60 to 69) | 81 | 17.6% | 12.4% | 73 | 13.9% | 11.3% | +8 | +3.7pp |
| Seniors (70 to 84) | 33 | 7.2% | 10.1% | 42 | 8.0% | 7.8% | -9 | -0.8pp |
| Elderly aged (85 and over) | 17 | 3.7% | 1.7% | 6 | 1.1% | 1.5% | +11 | +2.6pp |
| Total | 459 | 100.0% | 100.0% | 527 | 100.0% | 100.0% | -68 | 0.0pp |