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 Williams (S), accounting for 20.6% (210 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 55 people and 6 percentage points.
Section overview
Age structure - Service age groups
Williams (S) - Total persons (Usual residence)
This table summarises service age groups for Williams (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 Williams (S), with comparison markers for Regional WA.
Babies and pre-schoolers (0 to 4)
2021 count
70
% of total
6.9%
Change from 2016
-2.3pp
70
6.9%
-2.3pp
Primary schoolers (5 to 11)
2021 count
123
% of total
12.0%
Change from 2016
+1.6pp
123
12.0%
+1.6pp
Secondary schoolers (12 to 17)
2021 count
57
% of total
5.6%
Change from 2016
+2.9pp
57
5.6%
+2.9pp
Tertiary education and independence (18 to 24)
2021 count
47
% of total
4.6%
Change from 2016
+0.8pp
47
4.6%
+0.8pp
Young workforce (25 to 34)
2021 count
96
% of total
9.4%
Change from 2016
-4.1pp
96
9.4%
-4.1pp
Parents and homebuilders (35 to 49)
2021 count
210
% of total
20.6%
Change from 2016
+3.1pp
210
20.6%
+3.1pp
Older workers and pre-retirees (50 to 59)
2021 count
109
% of total
10.7%
Change from 2016
-6.0pp
109
10.7%
-6.0pp
Empty nesters and retirees (60 to 69)
2021 count
165
% of total
16.2%
Change from 2016
+2.9pp
165
16.2%
+2.9pp
Seniors (70 to 84)
2021 count
123
% of total
12.0%
Change from 2016
+0.4pp
123
12.0%
+0.4pp
Elderly aged (85 and over)
2021 count
17
% of total
1.7%
Change from 2016
+0.2pp
17
1.7%
+0.2pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-20
-2.3pp
Primary schoolers (5 to 11)
+21
+1.6pp
Secondary schoolers (12 to 17)
+31
+2.9pp
Tertiary education and independence (18 to 24)
+10
+0.8pp
Young workforce (25 to 34)
-36
-4.1pp
Parents and homebuilders (35 to 49)
+38
+3.1pp
Older workers and pre-retirees (50 to 59)
-55
-6.0pp
Empty nesters and retirees (60 to 69)
+35
+2.9pp
Seniors (70 to 84)
+9
+0.4pp
Elderly aged (85 and over)
+2
+0.2pp
Data table
Service age groups for Williams (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) | 70 | 6.9% | 6.0% | 90 | 9.2% | 6.6% | -20 | -2.3pp |
| Primary schoolers (5 to 11) | 123 | 12.0% | 9.5% | 102 | 10.4% | 9.8% | +21 | +1.6pp |
| Secondary schoolers (12 to 17) | 57 | 5.6% | 7.6% | 26 | 2.7% | 7.4% | +31 | +2.9pp |
| Tertiary education and independence (18 to 24) | 47 | 4.6% | 6.7% | 37 | 3.8% | 7.0% | +10 | +0.8pp |
| Young workforce (25 to 34) | 96 | 9.4% | 12.5% | 132 | 13.5% | 13.6% | -36 | -4.1pp |
| Parents and homebuilders (35 to 49) | 210 | 20.6% | 19.9% | 172 | 17.5% | 20.8% | +38 | +3.1pp |
| Older workers and pre-retirees (50 to 59) | 109 | 10.7% | 13.7% | 164 | 16.7% | 14.1% | -55 | -6.0pp |
| Empty nesters and retirees (60 to 69) | 165 | 16.2% | 12.4% | 130 | 13.3% | 11.3% | +35 | +2.9pp |
| Seniors (70 to 84) | 123 | 12.0% | 10.1% | 114 | 11.6% | 7.8% | +9 | +0.4pp |
| Elderly aged (85 and over) | 17 | 1.7% | 1.7% | 15 | 1.5% | 1.5% | +2 | +0.2pp |
| Total | 1,021 | 100.0% | 100.0% | 981 | 100.0% | 100.0% | +40 | 0.0pp |