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 Keilor Park, accounting for 20.5% (549 people). This share was higher than Brimbank (C) (19.9%). Since 2016, the biggest change was in Young workforce (25 to 34), which decreased by 2,861 people and 18.2 percentage points.
Section overview
Age structure - Service age groups
Keilor Park - Total persons (Usual residence)
This table summarises service age groups for Keilor Park in 2021 for persons, with comparison against Brimbank (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Keilor Park, with comparison markers for Brimbank (C).
Babies and pre-schoolers (0 to 4)
2021 count
159
% of total
5.9%
Change from 2016
-1.0pp
159
5.9%
-1.0pp
Primary schoolers (5 to 11)
2021 count
239
% of total
8.9%
Change from 2016
+3.1pp
239
8.9%
+3.1pp
Secondary schoolers (12 to 17)
2021 count
171
% of total
6.4%
Change from 2016
+3.1pp
171
6.4%
+3.1pp
Tertiary education and independence (18 to 24)
2021 count
146
% of total
5.4%
Change from 2016
-3.9pp
146
5.4%
-3.9pp
Young workforce (25 to 34)
2021 count
296
% of total
11.0%
Change from 2016
-18.2pp
296
11.0%
-18.2pp
Parents and homebuilders (35 to 49)
2021 count
549
% of total
20.5%
Change from 2016
-3.6pp
549
20.5%
-3.6pp
Older workers and pre-retirees (50 to 59)
2021 count
278
% of total
10.4%
Change from 2016
+1.3pp
278
10.4%
+1.3pp
Empty nesters and retirees (60 to 69)
2021 count
272
% of total
10.1%
Change from 2016
+3.3pp
272
10.1%
+3.3pp
Seniors (70 to 84)
2021 count
494
% of total
18.4%
Change from 2016
+14.1pp
494
18.4%
+14.1pp
Elderly aged (85 and over)
2021 count
65
% of total
2.4%
Change from 2016
+1.4pp
65
2.4%
+1.4pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-582
-1.0pp
Primary schoolers (5 to 11)
-392
+3.1pp
Secondary schoolers (12 to 17)
-188
+3.1pp
Tertiary education and independence (18 to 24)
-855
-3.9pp
Young workforce (25 to 34)
-2,861
-18.2pp
Parents and homebuilders (35 to 49)
-2,059
-3.6pp
Older workers and pre-retirees (50 to 59)
-707
+1.3pp
Empty nesters and retirees (60 to 69)
-466
+3.3pp
Seniors (70 to 84)
+28
+14.1pp
Elderly aged (85 and over)
-41
+1.4pp
Data table
Service age groups for Keilor Park. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Brimbank (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Brimbank (C)% | Count | % | Brimbank (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 159 | 5.9% | 5.6% | 741 | 6.9% | 6.7% | -582 | -1.0pp |
| Primary schoolers (5 to 11) | 239 | 8.9% | 8.3% | 631 | 5.8% | 8.3% | -392 | +3.1pp |
| Secondary schoolers (12 to 17) | 171 | 6.4% | 6.8% | 359 | 3.3% | 7.1% | -188 | +3.1pp |
| Tertiary education and independence (18 to 24) | 146 | 5.4% | 9.2% | 1,001 | 9.3% | 10.4% | -855 | -3.9pp |
| Young workforce (25 to 34) | 296 | 11.0% | 15.7% | 3,157 | 29.2% | 16.1% | -2,861 | -18.2pp |
| Parents and homebuilders (35 to 49) | 549 | 20.5% | 19.9% | 2,608 | 24.1% | 20.1% | -2,059 | -3.6pp |
| Older workers and pre-retirees (50 to 59) | 278 | 10.4% | 12.4% | 985 | 9.1% | 12.3% | -707 | +1.3pp |
| Empty nesters and retirees (60 to 69) | 272 | 10.1% | 10.9% | 738 | 6.8% | 10.1% | -466 | +3.3pp |
| Seniors (70 to 84) | 494 | 18.4% | 9.3% | 466 | 4.3% | 7.3% | +28 | +14.1pp |
| Elderly aged (85 and over) | 65 | 2.4% | 1.9% | 106 | 1.0% | 1.5% | -41 | +1.4pp |
| Total | 2,684 | 100.0% | 100.0% | 10,812 | 100.0% | 100.0% | -8,128 | 0.0pp |