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 Rosanna, accounting for 22.3% (1,923 people). This share was higher than Banyule (C) (21.3%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which increased by 1,923 people and 22.3 percentage points.
Section overview
Age structure - Service age groups
Rosanna - Total persons (Usual residence)
This table summarises service age groups for Rosanna in 2021 for persons, with comparison against Banyule (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Rosanna, with comparison markers for Banyule (C).
Babies and pre-schoolers (0 to 4)
2021 count
438
% of total
5.1%
Change from 2016
+5.1pp
438
5.1%
+5.1pp
Primary schoolers (5 to 11)
2021 count
886
% of total
10.3%
Change from 2016
+10.3pp
886
10.3%
+10.3pp
Secondary schoolers (12 to 17)
2021 count
619
% of total
7.2%
Change from 2016
+7.2pp
619
7.2%
+7.2pp
Tertiary education and independence (18 to 24)
2021 count
590
% of total
6.8%
Change from 2016
+6.8pp
590
6.8%
+6.8pp
Young workforce (25 to 34)
2021 count
933
% of total
10.8%
Change from 2016
+10.8pp
933
10.8%
+10.8pp
Parents and homebuilders (35 to 49)
2021 count
1,923
% of total
22.3%
Change from 2016
+22.3pp
1,923
22.3%
+22.3pp
Older workers and pre-retirees (50 to 59)
2021 count
1,024
% of total
11.9%
Change from 2016
+11.9pp
1,024
11.9%
+11.9pp
Empty nesters and retirees (60 to 69)
2021 count
847
% of total
9.8%
Change from 2016
-9.0pp
847
9.8%
-9.0pp
Seniors (70 to 84)
2021 count
913
% of total
10.6%
Change from 2016
+10.6pp
913
10.6%
+10.6pp
Elderly aged (85 and over)
2021 count
433
% of total
5.0%
Change from 2016
+5.0pp
433
5.0%
+5.0pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+438
+5.1pp
Primary schoolers (5 to 11)
+886
+10.3pp
Secondary schoolers (12 to 17)
+619
+7.2pp
Tertiary education and independence (18 to 24)
+590
+6.8pp
Young workforce (25 to 34)
+933
+10.8pp
Parents and homebuilders (35 to 49)
+1,923
+22.3pp
Older workers and pre-retirees (50 to 59)
+1,024
+11.9pp
Empty nesters and retirees (60 to 69)
+844
-9.0pp
Seniors (70 to 84)
+913
+10.6pp
Elderly aged (85 and over)
+433
+5.0pp
Data table
Service age groups for Rosanna. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Banyule (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Banyule (C)% | Count | % | Banyule (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 438 | 5.1% | 5.6% | 0 | 0.0% | 6.4% | +438 | +5.1pp |
| Primary schoolers (5 to 11) | 886 | 10.3% | 8.6% | 0 | 0.0% | 8.5% | +886 | +10.3pp |
| Secondary schoolers (12 to 17) | 619 | 7.2% | 6.9% | 0 | 0.0% | 6.5% | +619 | +7.2pp |
| Tertiary education and independence (18 to 24) | 590 | 6.8% | 7.7% | 0 | 0.0% | 8.4% | +590 | +6.8pp |
| Young workforce (25 to 34) | 933 | 10.8% | 12.9% | 0 | 0.0% | 13.3% | +933 | +10.8pp |
| Parents and homebuilders (35 to 49) | 1,923 | 22.3% | 21.3% | 0 | 0.0% | 21.1% | +1,923 | +22.3pp |
| Older workers and pre-retirees (50 to 59) | 1,024 | 11.9% | 12.4% | 0 | 0.0% | 12.7% | +1,024 | +11.9pp |
| Empty nesters and retirees (60 to 69) | 847 | 9.8% | 11.0% | 3 | 18.8% | 11.0% | +844 | -9.0pp |
| Seniors (70 to 84) | 913 | 10.6% | 11.0% | 0 | 0.0% | 9.4% | +913 | +10.6pp |
| Elderly aged (85 and over) | 433 | 5.0% | 2.7% | 0 | 0.0% | 2.7% | +433 | +5.0pp |
| Total | 8,616 | 100.0% | 100.0% | 16 | 100.0% | 100.0% | +8,600 | 0.0pp |