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, Young workforce (25 to 34) was the most common category among residents in Karnup, accounting for 20% (420 people). This share was higher than Rockingham (C) (13.5%). Since 2016, the biggest change was in Young workforce (25 to 34), which increased by 173 people and 2 percentage points.
Section overview
Age structure - Service age groups
Karnup - Total persons (Usual residence)
This table summarises service age groups for Karnup in 2021 for persons, with comparison against Rockingham (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Karnup, with comparison markers for Rockingham (C).
Babies and pre-schoolers (0 to 4)
2021 count
213
% of total
10.2%
Change from 2016
+1.6pp
213
10.2%
+1.6pp
Primary schoolers (5 to 11)
2021 count
243
% of total
11.6%
Change from 2016
+2.1pp
243
11.6%
+2.1pp
Secondary schoolers (12 to 17)
2021 count
190
% of total
9.1%
Change from 2016
+2.5pp
190
9.1%
+2.5pp
Tertiary education and independence (18 to 24)
2021 count
161
% of total
7.7%
Change from 2016
-5.9pp
161
7.7%
-5.9pp
Young workforce (25 to 34)
2021 count
420
% of total
20.0%
Change from 2016
+2.0pp
420
20.0%
+2.0pp
Parents and homebuilders (35 to 49)
2021 count
388
% of total
18.5%
Change from 2016
+1.0pp
388
18.5%
+1.0pp
Older workers and pre-retirees (50 to 59)
2021 count
195
% of total
9.3%
Change from 2016
-3.3pp
195
9.3%
-3.3pp
Empty nesters and retirees (60 to 69)
2021 count
165
% of total
7.9%
Change from 2016
+0.2pp
165
7.9%
+0.2pp
Seniors (70 to 84)
2021 count
120
% of total
5.7%
Change from 2016
+1.4pp
120
5.7%
+1.4pp
Elderly aged (85 and over)
2021 count
7
% of total
0.3%
Change from 2016
+0.1pp
7
0.3%
+0.1pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+95
+1.6pp
Primary schoolers (5 to 11)
+113
+2.1pp
Secondary schoolers (12 to 17)
+99
+2.5pp
Tertiary education and independence (18 to 24)
-25
-5.9pp
Young workforce (25 to 34)
+173
+2.0pp
Parents and homebuilders (35 to 49)
+148
+1.0pp
Older workers and pre-retirees (50 to 59)
+22
-3.3pp
Empty nesters and retirees (60 to 69)
+60
+0.2pp
Seniors (70 to 84)
+61
+1.4pp
Elderly aged (85 and over)
+4
+0.1pp
Data table
Service age groups for Karnup. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Rockingham (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Rockingham (C)% | Count | % | Rockingham (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 213 | 10.2% | 6.7% | 118 | 8.6% | 7.5% | +95 | +1.6pp |
| Primary schoolers (5 to 11) | 243 | 11.6% | 10.4% | 130 | 9.5% | 10.7% | +113 | +2.1pp |
| Secondary schoolers (12 to 17) | 190 | 9.1% | 8.6% | 91 | 6.6% | 8.1% | +99 | +2.5pp |
| Tertiary education and independence (18 to 24) | 161 | 7.7% | 8.4% | 186 | 13.6% | 9.3% | -25 | -5.9pp |
| Young workforce (25 to 34) | 420 | 20.0% | 13.5% | 247 | 18.0% | 14.6% | +173 | +2.0pp |
| Parents and homebuilders (35 to 49) | 388 | 18.5% | 20.1% | 240 | 17.5% | 20.8% | +148 | +1.0pp |
| Older workers and pre-retirees (50 to 59) | 195 | 9.3% | 12.8% | 173 | 12.6% | 12.1% | +22 | -3.3pp |
| Empty nesters and retirees (60 to 69) | 165 | 7.9% | 9.5% | 105 | 7.7% | 8.4% | +60 | +0.2pp |
| Seniors (70 to 84) | 120 | 5.7% | 8.3% | 59 | 4.3% | 7.0% | +61 | +1.4pp |
| Elderly aged (85 and over) | 7 | 0.3% | 1.5% | 3 | 0.2% | 1.4% | +4 | +0.1pp |
| Total | 2,096 | 100.0% | 100.0% | 1,371 | 100.0% | 100.0% | +725 | 0.0pp |