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 Willmot, accounting for 17.5% (418 people). This share was lower than Blacktown (C) (23.4%). Since 2016, the biggest change was in Empty nesters and retirees (60 to 69), which decreased by 62 people and 2.4 percentage points.
Section overview
Age structure - Service age groups
Willmot - Total persons (Usual residence)
This table summarises service age groups for Willmot in 2021 for persons, with comparison against Blacktown (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Willmot, with comparison markers for Blacktown (C).
Babies and pre-schoolers (0 to 4)
2021 count
171
% of total
7.2%
Change from 2016
-0.6pp
171
7.2%
-0.6pp
Primary schoolers (5 to 11)
2021 count
248
% of total
10.4%
Change from 2016
-2.3pp
248
10.4%
-2.3pp
Secondary schoolers (12 to 17)
2021 count
227
% of total
9.5%
Change from 2016
-1.9pp
227
9.5%
-1.9pp
Tertiary education and independence (18 to 24)
2021 count
259
% of total
10.9%
Change from 2016
0.0pp
259
10.9%
0.0pp
Young workforce (25 to 34)
2021 count
337
% of total
14.1%
Change from 2016
+1.5pp
337
14.1%
+1.5pp
Parents and homebuilders (35 to 49)
2021 count
418
% of total
17.5%
Change from 2016
+0.4pp
418
17.5%
+0.4pp
Older workers and pre-retirees (50 to 59)
2021 count
273
% of total
11.5%
Change from 2016
+0.9pp
273
11.5%
+0.9pp
Empty nesters and retirees (60 to 69)
2021 count
190
% of total
8.0%
Change from 2016
-2.4pp
190
8.0%
-2.4pp
Seniors (70 to 84)
2021 count
235
% of total
9.9%
Change from 2016
+2.6pp
235
9.9%
+2.6pp
Elderly aged (85 and over)
2021 count
14
% of total
0.6%
Change from 2016
+0.1pp
14
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)
-18
-0.6pp
Primary schoolers (5 to 11)
-61
-2.3pp
Secondary schoolers (12 to 17)
-50
-1.9pp
Tertiary education and independence (18 to 24)
-7
0.0pp
Young workforce (25 to 34)
+31
+1.5pp
Parents and homebuilders (35 to 49)
+2
+0.4pp
Older workers and pre-retirees (50 to 59)
+16
+0.9pp
Empty nesters and retirees (60 to 69)
-62
-2.4pp
Seniors (70 to 84)
+58
+2.6pp
Elderly aged (85 and over)
+1
+0.1pp
Data table
Service age groups for Willmot. 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) | 171 | 7.2% | 7.5% | 189 | 7.8% | 8.0% | -18 | -0.6pp |
| Primary schoolers (5 to 11) | 248 | 10.4% | 10.9% | 309 | 12.7% | 10.8% | -61 | -2.3pp |
| Secondary schoolers (12 to 17) | 227 | 9.5% | 8.0% | 277 | 11.4% | 8.2% | -50 | -1.9pp |
| Tertiary education and independence (18 to 24) | 259 | 10.9% | 9.1% | 266 | 10.9% | 9.5% | -7 | 0.0pp |
| Young workforce (25 to 34) | 337 | 14.1% | 14.9% | 306 | 12.6% | 15.5% | +31 | +1.5pp |
| Parents and homebuilders (35 to 49) | 418 | 17.5% | 23.4% | 416 | 17.1% | 21.7% | +2 | +0.4pp |
| Older workers and pre-retirees (50 to 59) | 273 | 11.5% | 10.7% | 257 | 10.6% | 11.4% | +16 | +0.9pp |
| Empty nesters and retirees (60 to 69) | 190 | 8.0% | 8.2% | 252 | 10.4% | 8.4% | -62 | -2.4pp |
| Seniors (70 to 84) | 235 | 9.9% | 6.2% | 177 | 7.3% | 5.4% | +58 | +2.6pp |
| Elderly aged (85 and over) | 14 | 0.6% | 1.1% | 13 | 0.5% | 1.1% | +1 | +0.1pp |
| Total | 2,382 | 100.0% | 100.0% | 2,430 | 100.0% | 100.0% | -48 | 0.0pp |