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 Girrawheen, accounting for 21.1% (1,874 people). This share was lower than Wanneroo (C) (21.7%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 157 people and 1.6 percentage points.
Section overview
Age structure - Service age groups
Girrawheen - Total persons (Usual residence)
This table summarises service age groups for Girrawheen in 2021 for persons, with comparison against Wanneroo (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Girrawheen, with comparison markers for Wanneroo (C).
Babies and pre-schoolers (0 to 4)
2021 count
589
% of total
6.6%
Change from 2016
-1.0pp
589
6.6%
-1.0pp
Primary schoolers (5 to 11)
2021 count
818
% of total
9.2%
Change from 2016
-0.9pp
818
9.2%
-0.9pp
Secondary schoolers (12 to 17)
2021 count
687
% of total
7.7%
Change from 2016
+0.2pp
687
7.7%
+0.2pp
Tertiary education and independence (18 to 24)
2021 count
845
% of total
9.5%
Change from 2016
-0.2pp
845
9.5%
-0.2pp
Young workforce (25 to 34)
2021 count
1,354
% of total
15.2%
Change from 2016
-1.0pp
1,354
15.2%
-1.0pp
Parents and homebuilders (35 to 49)
2021 count
1,874
% of total
21.1%
Change from 2016
+0.8pp
1,874
21.1%
+0.8pp
Older workers and pre-retirees (50 to 59)
2021 count
998
% of total
11.2%
Change from 2016
+0.3pp
998
11.2%
+0.3pp
Empty nesters and retirees (60 to 69)
2021 count
856
% of total
9.6%
Change from 2016
-0.1pp
856
9.6%
-0.1pp
Seniors (70 to 84)
2021 count
766
% of total
8.6%
Change from 2016
+1.6pp
766
8.6%
+1.6pp
Elderly aged (85 and over)
2021 count
100
% of total
1.1%
Change from 2016
+0.3pp
100
1.1%
+0.3pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-79
-1.0pp
Primary schoolers (5 to 11)
-66
-0.9pp
Secondary schoolers (12 to 17)
+26
+0.2pp
Tertiary education and independence (18 to 24)
-1
-0.2pp
Young workforce (25 to 34)
-65
-1.0pp
Parents and homebuilders (35 to 49)
+96
+0.8pp
Older workers and pre-retirees (50 to 59)
+45
+0.3pp
Empty nesters and retirees (60 to 69)
+2
-0.1pp
Seniors (70 to 84)
+157
+1.6pp
Elderly aged (85 and over)
+30
+0.3pp
Data table
Service age groups for Girrawheen. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Wanneroo (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Wanneroo (C)% | Count | % | Wanneroo (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 589 | 6.6% | 7.1% | 668 | 7.6% | 8.0% | -79 | -1.0pp |
| Primary schoolers (5 to 11) | 818 | 9.2% | 10.6% | 884 | 10.1% | 10.8% | -66 | -0.9pp |
| Secondary schoolers (12 to 17) | 687 | 7.7% | 8.5% | 661 | 7.5% | 8.5% | +26 | +0.2pp |
| Tertiary education and independence (18 to 24) | 845 | 9.5% | 9.0% | 846 | 9.7% | 9.6% | -1 | -0.2pp |
| Young workforce (25 to 34) | 1,354 | 15.2% | 13.9% | 1,419 | 16.2% | 15.7% | -65 | -1.0pp |
| Parents and homebuilders (35 to 49) | 1,874 | 21.1% | 21.7% | 1,778 | 20.3% | 22.4% | +96 | +0.8pp |
| Older workers and pre-retirees (50 to 59) | 998 | 11.2% | 12.5% | 953 | 10.9% | 11.2% | +45 | +0.3pp |
| Empty nesters and retirees (60 to 69) | 856 | 9.6% | 8.5% | 854 | 9.7% | 7.4% | +2 | -0.1pp |
| Seniors (70 to 84) | 766 | 8.6% | 7.0% | 609 | 7.0% | 5.4% | +157 | +1.6pp |
| Elderly aged (85 and over) | 100 | 1.1% | 1.3% | 70 | 0.8% | 1.0% | +30 | +0.3pp |
| Total | 8,897 | 100.0% | 100.0% | 8,759 | 100.0% | 100.0% | +138 | 0.0pp |