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 Bidwill (NSW), accounting for 15.5% (651 people). This share was lower than Blacktown (C) (23.4%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 48 people and 1.3 percentage points.
Section overview
Age structure - Service age groups
Bidwill (NSW) - Total persons (Usual residence)
This table summarises service age groups for Bidwill (NSW) in 2021 for persons, with comparison against Blacktown (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Bidwill (NSW), with comparison markers for Blacktown (C).
Babies and pre-schoolers (0 to 4)
2021 count
355
% of total
8.4%
Change from 2016
-0.7pp
355
8.4%
-0.7pp
Primary schoolers (5 to 11)
2021 count
539
% of total
12.8%
Change from 2016
+0.2pp
539
12.8%
+0.2pp
Secondary schoolers (12 to 17)
2021 count
453
% of total
10.8%
Change from 2016
-0.3pp
453
10.8%
-0.3pp
Tertiary education and independence (18 to 24)
2021 count
441
% of total
10.5%
Change from 2016
-0.8pp
441
10.5%
-0.8pp
Young workforce (25 to 34)
2021 count
561
% of total
13.4%
Change from 2016
+0.8pp
561
13.4%
+0.8pp
Parents and homebuilders (35 to 49)
2021 count
651
% of total
15.5%
Change from 2016
-0.6pp
651
15.5%
-0.6pp
Older workers and pre-retirees (50 to 59)
2021 count
467
% of total
11.1%
Change from 2016
+0.4pp
467
11.1%
+0.4pp
Empty nesters and retirees (60 to 69)
2021 count
400
% of total
9.5%
Change from 2016
-0.7pp
400
9.5%
-0.7pp
Seniors (70 to 84)
2021 count
305
% of total
7.3%
Change from 2016
+1.3pp
305
7.3%
+1.3pp
Elderly aged (85 and over)
2021 count
27
% of total
0.6%
Change from 2016
+0.1pp
27
0.6%
+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)
-36
-0.7pp
Primary schoolers (5 to 11)
-1
+0.2pp
Secondary schoolers (12 to 17)
-21
-0.3pp
Tertiary education and independence (18 to 24)
-44
-0.8pp
Young workforce (25 to 34)
+23
+0.8pp
Parents and homebuilders (35 to 49)
-38
-0.6pp
Older workers and pre-retirees (50 to 59)
+10
+0.4pp
Empty nesters and retirees (60 to 69)
-35
-0.7pp
Seniors (70 to 84)
+48
+1.3pp
Elderly aged (85 and over)
+7
+0.1pp
Data table
Service age groups for Bidwill (NSW). 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) | 355 | 8.4% | 7.5% | 391 | 9.1% | 8.0% | -36 | -0.7pp |
| Primary schoolers (5 to 11) | 539 | 12.8% | 10.9% | 540 | 12.6% | 10.8% | -1 | +0.2pp |
| Secondary schoolers (12 to 17) | 453 | 10.8% | 8.0% | 474 | 11.1% | 8.2% | -21 | -0.3pp |
| Tertiary education and independence (18 to 24) | 441 | 10.5% | 9.1% | 485 | 11.3% | 9.5% | -44 | -0.8pp |
| Young workforce (25 to 34) | 561 | 13.4% | 14.9% | 538 | 12.6% | 15.5% | +23 | +0.8pp |
| Parents and homebuilders (35 to 49) | 651 | 15.5% | 23.4% | 689 | 16.1% | 21.7% | -38 | -0.6pp |
| Older workers and pre-retirees (50 to 59) | 467 | 11.1% | 10.7% | 457 | 10.7% | 11.4% | +10 | +0.4pp |
| Empty nesters and retirees (60 to 69) | 400 | 9.5% | 8.2% | 435 | 10.2% | 8.4% | -35 | -0.7pp |
| Seniors (70 to 84) | 305 | 7.3% | 6.2% | 257 | 6.0% | 5.4% | +48 | +1.3pp |
| Elderly aged (85 and over) | 27 | 0.6% | 1.1% | 20 | 0.5% | 1.1% | +7 | +0.1pp |
| Total | 4,202 | 100.0% | 100.0% | 4,280 | 100.0% | 100.0% | -78 | 0.0pp |