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, Seniors (70 to 84) was the most common category among residents in Erskine (WA), accounting for 31% (1,684 people). This share was higher than Mandurah (C) (15.6%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 1,332 people and 14.6 percentage points.
Section overview
Age structure - Service age groups
Erskine (WA) - Total persons (Usual residence)
This table summarises service age groups for Erskine (WA) in 2021 for persons, with comparison against Mandurah (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Erskine (WA), with comparison markers for Mandurah (C).
Babies and pre-schoolers (0 to 4)
2021 count
200
% of total
3.7%
Change from 2016
-0.7pp
200
3.7%
-0.7pp
Primary schoolers (5 to 11)
2021 count
299
% of total
5.5%
Change from 2016
-0.6pp
299
5.5%
-0.6pp
Secondary schoolers (12 to 17)
2021 count
248
% of total
4.6%
Change from 2016
-0.4pp
248
4.6%
-0.4pp
Tertiary education and independence (18 to 24)
2021 count
262
% of total
4.8%
Change from 2016
-3.6pp
262
4.8%
-3.6pp
Young workforce (25 to 34)
2021 count
421
% of total
7.8%
Change from 2016
-3.4pp
421
7.8%
-3.4pp
Parents and homebuilders (35 to 49)
2021 count
644
% of total
11.9%
Change from 2016
-2.8pp
644
11.9%
-2.8pp
Older workers and pre-retirees (50 to 59)
2021 count
528
% of total
9.7%
Change from 2016
-4.9pp
528
9.7%
-4.9pp
Empty nesters and retirees (60 to 69)
2021 count
892
% of total
16.4%
Change from 2016
+4.8pp
892
16.4%
+4.8pp
Seniors (70 to 84)
2021 count
1,684
% of total
31.0%
Change from 2016
+14.6pp
1,684
31.0%
+14.6pp
Elderly aged (85 and over)
2021 count
261
% of total
4.8%
Change from 2016
-2.0pp
261
4.8%
-2.0pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+105
-0.7pp
Primary schoolers (5 to 11)
+168
-0.6pp
Secondary schoolers (12 to 17)
+140
-0.4pp
Tertiary education and independence (18 to 24)
+82
-3.6pp
Young workforce (25 to 34)
+180
-3.4pp
Parents and homebuilders (35 to 49)
+328
-2.8pp
Older workers and pre-retirees (50 to 59)
+215
-4.9pp
Empty nesters and retirees (60 to 69)
+644
+4.8pp
Seniors (70 to 84)
+1,332
+14.6pp
Elderly aged (85 and over)
+115
-2.0pp
Data table
Service age groups for Erskine (WA). Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Mandurah (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Mandurah (C)% | Count | % | Mandurah (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 200 | 3.7% | 5.3% | 95 | 4.4% | 5.8% | +105 | -0.7pp |
| Primary schoolers (5 to 11) | 299 | 5.5% | 8.3% | 131 | 6.1% | 8.7% | +168 | -0.6pp |
| Secondary schoolers (12 to 17) | 248 | 4.6% | 7.2% | 108 | 5.0% | 7.1% | +140 | -0.4pp |
| Tertiary education and independence (18 to 24) | 262 | 4.8% | 7.0% | 180 | 8.4% | 7.8% | +82 | -3.6pp |
| Young workforce (25 to 34) | 421 | 7.8% | 10.2% | 241 | 11.2% | 10.9% | +180 | -3.4pp |
| Parents and homebuilders (35 to 49) | 644 | 11.9% | 16.9% | 316 | 14.7% | 17.9% | +328 | -2.8pp |
| Older workers and pre-retirees (50 to 59) | 528 | 9.7% | 12.8% | 313 | 14.6% | 12.8% | +215 | -4.9pp |
| Empty nesters and retirees (60 to 69) | 892 | 16.4% | 13.6% | 248 | 11.6% | 13.2% | +644 | +4.8pp |
| Seniors (70 to 84) | 1,684 | 31.0% | 15.6% | 352 | 16.4% | 13.2% | +1,332 | +14.6pp |
| Elderly aged (85 and over) | 261 | 4.8% | 3.0% | 146 | 6.8% | 2.6% | +115 | -2.0pp |
| Total | 5,429 | 100.0% | 100.0% | 2,144 | 100.0% | 100.0% | +3,285 | 0.0pp |