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 Dharruk, accounting for 18% (505 people). This share was lower than Blacktown (C) (23.4%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 118 people and 4.1 percentage points.
Section overview
Age structure - Service age groups
Dharruk - Total persons (Usual residence)
This table summarises service age groups for Dharruk in 2021 for persons, with comparison against Blacktown (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Dharruk, with comparison markers for Blacktown (C).
Babies and pre-schoolers (0 to 4)
2021 count
210
% of total
7.5%
Change from 2016
+0.1pp
210
7.5%
+0.1pp
Primary schoolers (5 to 11)
2021 count
306
% of total
10.9%
Change from 2016
+0.1pp
306
10.9%
+0.1pp
Secondary schoolers (12 to 17)
2021 count
254
% of total
9.1%
Change from 2016
-0.2pp
254
9.1%
-0.2pp
Tertiary education and independence (18 to 24)
2021 count
244
% of total
8.7%
Change from 2016
-0.5pp
244
8.7%
-0.5pp
Young workforce (25 to 34)
2021 count
383
% of total
13.6%
Change from 2016
-0.4pp
383
13.6%
-0.4pp
Parents and homebuilders (35 to 49)
2021 count
505
% of total
18.0%
Change from 2016
-0.6pp
505
18.0%
-0.6pp
Older workers and pre-retirees (50 to 59)
2021 count
345
% of total
12.3%
Change from 2016
-0.2pp
345
12.3%
-0.2pp
Empty nesters and retirees (60 to 69)
2021 count
297
% of total
10.6%
Change from 2016
-1.5pp
297
10.6%
-1.5pp
Seniors (70 to 84)
2021 count
272
% of total
9.7%
Change from 2016
+4.1pp
272
9.7%
+4.1pp
Elderly aged (85 and over)
2021 count
19
% of total
0.7%
Change from 2016
+0.1pp
19
0.7%
+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)
+5
+0.1pp
Primary schoolers (5 to 11)
+7
+0.1pp
Secondary schoolers (12 to 17)
-5
-0.2pp
Tertiary education and independence (18 to 24)
-11
-0.5pp
Young workforce (25 to 34)
-4
-0.4pp
Parents and homebuilders (35 to 49)
-12
-0.6pp
Older workers and pre-retirees (50 to 59)
-2
-0.2pp
Empty nesters and retirees (60 to 69)
-39
-1.5pp
Seniors (70 to 84)
+118
+4.1pp
Elderly aged (85 and over)
+2
+0.1pp
Data table
Service age groups for Dharruk. 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) | 210 | 7.5% | 7.5% | 205 | 7.4% | 8.0% | +5 | +0.1pp |
| Primary schoolers (5 to 11) | 306 | 10.9% | 10.9% | 299 | 10.8% | 10.8% | +7 | +0.1pp |
| Secondary schoolers (12 to 17) | 254 | 9.1% | 8.0% | 259 | 9.3% | 8.2% | -5 | -0.2pp |
| Tertiary education and independence (18 to 24) | 244 | 8.7% | 9.1% | 255 | 9.2% | 9.5% | -11 | -0.5pp |
| Young workforce (25 to 34) | 383 | 13.6% | 14.9% | 387 | 14.0% | 15.5% | -4 | -0.4pp |
| Parents and homebuilders (35 to 49) | 505 | 18.0% | 23.4% | 517 | 18.6% | 21.7% | -12 | -0.6pp |
| Older workers and pre-retirees (50 to 59) | 345 | 12.3% | 10.7% | 347 | 12.5% | 11.4% | -2 | -0.2pp |
| Empty nesters and retirees (60 to 69) | 297 | 10.6% | 8.2% | 336 | 12.1% | 8.4% | -39 | -1.5pp |
| Seniors (70 to 84) | 272 | 9.7% | 6.2% | 154 | 5.6% | 5.4% | +118 | +4.1pp |
| Elderly aged (85 and over) | 19 | 0.7% | 1.1% | 17 | 0.6% | 1.1% | +2 | +0.1pp |
| Total | 2,806 | 100.0% | 100.0% | 2,774 | 100.0% | 100.0% | +32 | 0.0pp |