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 Tertiary education and independence (18 to 24), which decreased by 89 people and 1.8 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
-1.6pp
308
8.3%
-1.6pp
Primary schoolers (5 to 11)
2021 count
461
% of total
12.5%
Change from 2016
+0.3pp
461
12.5%
+0.3pp
Secondary schoolers (12 to 17)
2021 count
355
% of total
9.6%
Change from 2016
-0.6pp
355
9.6%
-0.6pp
Tertiary education and independence (18 to 24)
2021 count
382
% of total
10.3%
Change from 2016
-1.8pp
382
10.3%
-1.8pp
Young workforce (25 to 34)
2021 count
527
% of total
14.2%
Change from 2016
+1.9pp
527
14.2%
+1.9pp
Parents and homebuilders (35 to 49)
2021 count
606
% of total
16.4%
Change from 2016
+0.8pp
606
16.4%
+0.8pp
Older workers and pre-retirees (50 to 59)
2021 count
417
% of total
11.3%
Change from 2016
0.0pp
417
11.3%
0.0pp
Empty nesters and retirees (60 to 69)
2021 count
315
% of total
8.5%
Change from 2016
+0.7pp
315
8.5%
+0.7pp
Seniors (70 to 84)
2021 count
269
% of total
7.3%
Change from 2016
-0.9pp
269
7.3%
-0.9pp
Elderly aged (85 and over)
2021 count
41
% of total
1.1%
Change from 2016
+0.3pp
41
1.1%
+0.3pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-77
-1.6pp
Primary schoolers (5 to 11)
-15
+0.3pp
Secondary schoolers (12 to 17)
-40
-0.6pp
Tertiary education and independence (18 to 24)
-89
-1.8pp
Young workforce (25 to 34)
+50
+1.9pp
Parents and homebuilders (35 to 49)
-2
+0.8pp
Older workers and pre-retirees (50 to 59)
-22
0.0pp
Empty nesters and retirees (60 to 69)
+12
+0.7pp
Seniors (70 to 84)
-49
-0.9pp
Elderly aged (85 and over)
+9
+0.3pp
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% | 385 | 9.9% | 8.0% | -77 | -1.6pp |
| Primary schoolers (5 to 11) | 461 | 12.5% | 10.9% | 476 | 12.2% | 10.8% | -15 | +0.3pp |
| Secondary schoolers (12 to 17) | 355 | 9.6% | 8.0% | 395 | 10.2% | 8.2% | -40 | -0.6pp |
| Tertiary education and independence (18 to 24) | 382 | 10.3% | 9.1% | 471 | 12.1% | 9.5% | -89 | -1.8pp |
| Young workforce (25 to 34) | 527 | 14.2% | 14.9% | 477 | 12.3% | 15.5% | +50 | +1.9pp |
| Parents and homebuilders (35 to 49) | 606 | 16.4% | 23.4% | 608 | 15.6% | 21.7% | -2 | +0.8pp |
| Older workers and pre-retirees (50 to 59) | 417 | 11.3% | 10.7% | 439 | 11.3% | 11.4% | -22 | 0.0pp |
| Empty nesters and retirees (60 to 69) | 315 | 8.5% | 8.2% | 303 | 7.8% | 8.4% | +12 | +0.7pp |
| Seniors (70 to 84) | 269 | 7.3% | 6.2% | 318 | 8.2% | 5.4% | -49 | -0.9pp |
| Elderly aged (85 and over) | 41 | 1.1% | 1.1% | 32 | 0.8% | 1.1% | +9 | +0.3pp |
| Total | 3,700 | 100.0% | 100.0% | 3,886 | 100.0% | 100.0% | -186 | 0.0pp |