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 Blackett, accounting for 17.4% (625 people). This share was lower than Blacktown (C) (23.4%). Since 2016, the biggest change was in Young workforce (25 to 34), which increased by 68 people and 1.4 percentage points.
Section overview
Age structure - Service age groups
Blackett - Total persons (Usual residence)
This table summarises service age groups for Blackett in 2021 for persons, with comparison against Blacktown (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Blackett, with comparison markers for Blacktown (C).
Babies and pre-schoolers (0 to 4)
2021 count
289
% of total
8.1%
Change from 2016
-1.7pp
289
8.1%
-1.7pp
Primary schoolers (5 to 11)
2021 count
457
% of total
12.7%
Change from 2016
+0.9pp
457
12.7%
+0.9pp
Secondary schoolers (12 to 17)
2021 count
334
% of total
9.3%
Change from 2016
-0.6pp
334
9.3%
-0.6pp
Tertiary education and independence (18 to 24)
2021 count
378
% of total
10.5%
Change from 2016
+0.1pp
378
10.5%
+0.1pp
Young workforce (25 to 34)
2021 count
503
% of total
14.0%
Change from 2016
+1.4pp
503
14.0%
+1.4pp
Parents and homebuilders (35 to 49)
2021 count
625
% of total
17.4%
Change from 2016
-0.6pp
625
17.4%
-0.6pp
Older workers and pre-retirees (50 to 59)
2021 count
384
% of total
10.7%
Change from 2016
+0.2pp
384
10.7%
+0.2pp
Empty nesters and retirees (60 to 69)
2021 count
284
% of total
7.9%
Change from 2016
-0.9pp
284
7.9%
-0.9pp
Seniors (70 to 84)
2021 count
321
% of total
9.0%
Change from 2016
+1.2pp
321
9.0%
+1.2pp
Elderly aged (85 and over)
2021 count
23
% of total
0.6%
Change from 2016
0.0pp
23
0.6%
0.0pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-51
-1.7pp
Primary schoolers (5 to 11)
+48
+0.9pp
Secondary schoolers (12 to 17)
-7
-0.6pp
Tertiary education and independence (18 to 24)
+19
+0.1pp
Young workforce (25 to 34)
+68
+1.4pp
Parents and homebuilders (35 to 49)
+2
-0.6pp
Older workers and pre-retirees (50 to 59)
+22
+0.2pp
Empty nesters and retirees (60 to 69)
-21
-0.9pp
Seniors (70 to 84)
+53
+1.2pp
Elderly aged (85 and over)
+1
0.0pp
Data table
Service age groups for Blackett. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Blacktown (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Blacktown (C)% | Count | % | Blacktown (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 289 | 8.1% | 7.5% | 340 | 9.8% | 8.0% | -51 | -1.7pp |
| Primary schoolers (5 to 11) | 457 | 12.7% | 10.9% | 409 | 11.8% | 10.8% | +48 | +0.9pp |
| Secondary schoolers (12 to 17) | 334 | 9.3% | 8.0% | 341 | 9.9% | 8.2% | -7 | -0.6pp |
| Tertiary education and independence (18 to 24) | 378 | 10.5% | 9.1% | 359 | 10.4% | 9.5% | +19 | +0.1pp |
| Young workforce (25 to 34) | 503 | 14.0% | 14.9% | 435 | 12.6% | 15.5% | +68 | +1.4pp |
| Parents and homebuilders (35 to 49) | 625 | 17.4% | 23.4% | 623 | 18.0% | 21.7% | +2 | -0.6pp |
| Older workers and pre-retirees (50 to 59) | 384 | 10.7% | 10.7% | 362 | 10.5% | 11.4% | +22 | +0.2pp |
| Empty nesters and retirees (60 to 69) | 284 | 7.9% | 8.2% | 305 | 8.8% | 8.4% | -21 | -0.9pp |
| Seniors (70 to 84) | 321 | 9.0% | 6.2% | 268 | 7.8% | 5.4% | +53 | +1.2pp |
| Elderly aged (85 and over) | 23 | 0.6% | 1.1% | 22 | 0.6% | 1.1% | +1 | 0.0pp |
| Total | 3,586 | 100.0% | 100.0% | 3,452 | 100.0% | 100.0% | +134 | 0.0pp |