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 The Basin (Vic.), accounting for 21% (945 people). This share was higher than Knox (C) (20.7%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 132 people and 2.9 percentage points.
Section overview
Age structure - Service age groups
The Basin (Vic.) - Total persons (Usual residence)
This table summarises service age groups for The Basin (Vic.) in 2021 for persons, with comparison against Knox (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for The Basin (Vic.), with comparison markers for Knox (C).
Babies and pre-schoolers (0 to 4)
2021 count
257
% of total
5.7%
Change from 2016
-1.0pp
257
5.7%
-1.0pp
Primary schoolers (5 to 11)
2021 count
430
% of total
9.6%
Change from 2016
+0.1pp
430
9.6%
+0.1pp
Secondary schoolers (12 to 17)
2021 count
355
% of total
7.9%
Change from 2016
+1.0pp
355
7.9%
+1.0pp
Tertiary education and independence (18 to 24)
2021 count
324
% of total
7.2%
Change from 2016
-0.6pp
324
7.2%
-0.6pp
Young workforce (25 to 34)
2021 count
522
% of total
11.6%
Change from 2016
-0.7pp
522
11.6%
-0.7pp
Parents and homebuilders (35 to 49)
2021 count
945
% of total
21.0%
Change from 2016
-1.0pp
945
21.0%
-1.0pp
Older workers and pre-retirees (50 to 59)
2021 count
618
% of total
13.7%
Change from 2016
-0.2pp
618
13.7%
-0.2pp
Empty nesters and retirees (60 to 69)
2021 count
512
% of total
11.4%
Change from 2016
+0.2pp
512
11.4%
+0.2pp
Seniors (70 to 84)
2021 count
416
% of total
9.3%
Change from 2016
+2.9pp
416
9.3%
+2.9pp
Elderly aged (85 and over)
2021 count
114
% of total
2.5%
Change from 2016
-0.1pp
114
2.5%
-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)
-37
-1.0pp
Primary schoolers (5 to 11)
+10
+0.1pp
Secondary schoolers (12 to 17)
+52
+1.0pp
Tertiary education and independence (18 to 24)
-19
-0.6pp
Young workforce (25 to 34)
-21
-0.7pp
Parents and homebuilders (35 to 49)
-26
-1.0pp
Older workers and pre-retirees (50 to 59)
+4
-0.2pp
Empty nesters and retirees (60 to 69)
+18
+0.2pp
Seniors (70 to 84)
+132
+2.9pp
Elderly aged (85 and over)
+1
-0.1pp
Data table
Service age groups for The Basin (Vic.). Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Knox (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Knox (C)% | Count | % | Knox (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 257 | 5.7% | 5.3% | 294 | 6.7% | 5.9% | -37 | -1.0pp |
| Primary schoolers (5 to 11) | 430 | 9.6% | 8.2% | 420 | 9.5% | 8.2% | +10 | +0.1pp |
| Secondary schoolers (12 to 17) | 355 | 7.9% | 7.0% | 303 | 6.9% | 7.3% | +52 | +1.0pp |
| Tertiary education and independence (18 to 24) | 324 | 7.2% | 8.4% | 343 | 7.8% | 9.3% | -19 | -0.6pp |
| Young workforce (25 to 34) | 522 | 11.6% | 12.7% | 543 | 12.3% | 13.2% | -21 | -0.7pp |
| Parents and homebuilders (35 to 49) | 945 | 21.0% | 20.7% | 971 | 22.0% | 20.6% | -26 | -1.0pp |
| Older workers and pre-retirees (50 to 59) | 618 | 13.7% | 13.5% | 614 | 13.9% | 14.0% | +4 | -0.2pp |
| Empty nesters and retirees (60 to 69) | 512 | 11.4% | 11.6% | 494 | 11.2% | 11.3% | +18 | +0.2pp |
| Seniors (70 to 84) | 416 | 9.3% | 10.2% | 284 | 6.4% | 8.3% | +132 | +2.9pp |
| Elderly aged (85 and over) | 114 | 2.5% | 2.2% | 113 | 2.6% | 2.0% | +1 | -0.1pp |
| Total | 4,497 | 100.0% | 100.0% | 4,416 | 100.0% | 100.0% | +81 | 0.0pp |