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 Greenfields, accounting for 17.2% (1,700 people). This share was higher than Mandurah (C) (15.6%). Since 2016, the biggest change was in Elderly aged (85 and over), which increased by 151 people and 1.5 percentage points.
Section overview
Age structure - Service age groups
Greenfields - Total persons (Usual residence)
This table summarises service age groups for Greenfields in 2021 for persons, with comparison against Mandurah (C) and change since 2016.
Chart view
Age structure - Service age groups snapshot
2021 distribution by category for Greenfields, with comparison markers for Mandurah (C).
Babies and pre-schoolers (0 to 4)
2021 count
506
% of total
5.1%
Change from 2016
-0.9pp
506
5.1%
-0.9pp
Primary schoolers (5 to 11)
2021 count
830
% of total
8.4%
Change from 2016
+0.1pp
830
8.4%
+0.1pp
Secondary schoolers (12 to 17)
2021 count
673
% of total
6.8%
Change from 2016
-0.4pp
673
6.8%
-0.4pp
Tertiary education and independence (18 to 24)
2021 count
742
% of total
7.5%
Change from 2016
-0.5pp
742
7.5%
-0.5pp
Young workforce (25 to 34)
2021 count
1,009
% of total
10.2%
Change from 2016
-1.2pp
1,009
10.2%
-1.2pp
Parents and homebuilders (35 to 49)
2021 count
1,466
% of total
14.9%
Change from 2016
-1.0pp
1,466
14.9%
-1.0pp
Older workers and pre-retirees (50 to 59)
2021 count
1,259
% of total
12.8%
Change from 2016
+1.2pp
1,259
12.8%
+1.2pp
Empty nesters and retirees (60 to 69)
2021 count
1,180
% of total
12.0%
Change from 2016
+1.0pp
1,180
12.0%
+1.0pp
Seniors (70 to 84)
2021 count
1,700
% of total
17.2%
Change from 2016
+0.3pp
1,700
17.2%
+0.3pp
Elderly aged (85 and over)
2021 count
507
% of total
5.1%
Change from 2016
+1.5pp
507
5.1%
+1.5pp
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-82
-0.9pp
Primary schoolers (5 to 11)
+10
+0.1pp
Secondary schoolers (12 to 17)
-33
-0.4pp
Tertiary education and independence (18 to 24)
-50
-0.5pp
Young workforce (25 to 34)
-117
-1.2pp
Parents and homebuilders (35 to 49)
-101
-1.0pp
Older workers and pre-retirees (50 to 59)
+114
+1.2pp
Empty nesters and retirees (60 to 69)
+99
+1.0pp
Seniors (70 to 84)
+32
+0.3pp
Elderly aged (85 and over)
+151
+1.5pp
Data table
Service age groups for Greenfields. 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) | 506 | 5.1% | 5.3% | 588 | 6.0% | 5.8% | -82 | -0.9pp |
| Primary schoolers (5 to 11) | 830 | 8.4% | 8.3% | 820 | 8.3% | 8.7% | +10 | +0.1pp |
| Secondary schoolers (12 to 17) | 673 | 6.8% | 7.2% | 706 | 7.2% | 7.1% | -33 | -0.4pp |
| Tertiary education and independence (18 to 24) | 742 | 7.5% | 7.0% | 792 | 8.0% | 7.8% | -50 | -0.5pp |
| Young workforce (25 to 34) | 1,009 | 10.2% | 10.2% | 1,126 | 11.4% | 10.9% | -117 | -1.2pp |
| Parents and homebuilders (35 to 49) | 1,466 | 14.9% | 16.9% | 1,567 | 15.9% | 17.9% | -101 | -1.0pp |
| Older workers and pre-retirees (50 to 59) | 1,259 | 12.8% | 12.8% | 1,145 | 11.6% | 12.8% | +114 | +1.2pp |
| Empty nesters and retirees (60 to 69) | 1,180 | 12.0% | 13.6% | 1,081 | 11.0% | 13.2% | +99 | +1.0pp |
| Seniors (70 to 84) | 1,700 | 17.2% | 15.6% | 1,668 | 16.9% | 13.2% | +32 | +0.3pp |
| Elderly aged (85 and over) | 507 | 5.1% | 3.0% | 356 | 3.6% | 2.6% | +151 | +1.5pp |
| Total | 9,869 | 100.0% | 100.0% | 9,855 | 100.0% | 100.0% | +14 | 0.0pp |