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 Tregear, accounting for 16.4% (606 people). This share was lower than Blacktown (C) (23.4%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which increased by 603 people and 12.4 percentage points.
Section overview
Age structure - Service age groups
Tregear - Total persons (Usual residence)
This table summarises service age groups for Tregear in 2021 for persons, with comparison against Blacktown (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Tregear, with comparison markers for Blacktown (C).
Babies and pre-schoolers (0 to 4)
2021 count
308
% of total
8.3%
Change from 2016
+8.3pp
308
8.3%
+8.3pp
Primary schoolers (5 to 11)
2021 count
461
% of total
12.5%
Change from 2016
-2.2pp
461
12.5%
-2.2pp
Secondary schoolers (12 to 17)
2021 count
355
% of total
9.6%
Change from 2016
+9.6pp
355
9.6%
+9.6pp
Tertiary education and independence (18 to 24)
2021 count
382
% of total
10.3%
Change from 2016
+10.3pp
382
10.3%
+10.3pp
Young workforce (25 to 34)
2021 count
527
% of total
14.2%
Change from 2016
+10.2pp
527
14.2%
+10.2pp
Parents and homebuilders (35 to 49)
2021 count
606
% of total
16.4%
Change from 2016
+12.4pp
606
16.4%
+12.4pp
Older workers and pre-retirees (50 to 59)
2021 count
417
% of total
11.3%
Change from 2016
+6.0pp
417
11.3%
+6.0pp
Empty nesters and retirees (60 to 69)
2021 count
315
% of total
8.5%
Change from 2016
-18.2pp
315
8.5%
-18.2pp
Seniors (70 to 84)
2021 count
269
% of total
7.3%
Change from 2016
+3.3pp
269
7.3%
+3.3pp
Elderly aged (85 and over)
2021 count
41
% of total
1.1%
Change from 2016
+1.1pp
41
1.1%
+1.1pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+308
+8.3pp
Primary schoolers (5 to 11)
+450
-2.2pp
Secondary schoolers (12 to 17)
+355
+9.6pp
Tertiary education and independence (18 to 24)
+382
+10.3pp
Young workforce (25 to 34)
+524
+10.2pp
Parents and homebuilders (35 to 49)
+603
+12.4pp
Older workers and pre-retirees (50 to 59)
+413
+6.0pp
Empty nesters and retirees (60 to 69)
+295
-18.2pp
Seniors (70 to 84)
+266
+3.3pp
Elderly aged (85 and over)
+41
+1.1pp
Data table
Service age groups for Tregear. 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) | 308 | 8.3% | 7.5% | 0 | 0.0% | 8.0% | +308 | +8.3pp |
| Primary schoolers (5 to 11) | 461 | 12.5% | 10.9% | 11 | 14.7% | 10.8% | +450 | -2.2pp |
| Secondary schoolers (12 to 17) | 355 | 9.6% | 8.0% | 0 | 0.0% | 8.2% | +355 | +9.6pp |
| Tertiary education and independence (18 to 24) | 382 | 10.3% | 9.1% | 0 | 0.0% | 9.5% | +382 | +10.3pp |
| Young workforce (25 to 34) | 527 | 14.2% | 14.9% | 3 | 4.0% | 15.5% | +524 | +10.2pp |
| Parents and homebuilders (35 to 49) | 606 | 16.4% | 23.4% | 3 | 4.0% | 21.7% | +603 | +12.4pp |
| Older workers and pre-retirees (50 to 59) | 417 | 11.3% | 10.7% | 4 | 5.3% | 11.4% | +413 | +6.0pp |
| Empty nesters and retirees (60 to 69) | 315 | 8.5% | 8.2% | 20 | 26.7% | 8.4% | +295 | -18.2pp |
| Seniors (70 to 84) | 269 | 7.3% | 6.2% | 3 | 4.0% | 5.4% | +266 | +3.3pp |
| Elderly aged (85 and over) | 41 | 1.1% | 1.1% | 0 | 0.0% | 1.1% | +41 | +1.1pp |
| Total | 3,700 | 100.0% | 100.0% | 75 | 100.0% | 100.0% | +3,625 | 0.0pp |