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 Grantham Farm, accounting for 25.5% (934 people). This share was higher than Blacktown (C) (23.4%). Since 2016, the biggest change was in Young workforce (25 to 34), which increased by 755 people and 8.2 percentage points.
Section overview
Age structure - Service age groups
Grantham Farm - Total persons (Usual residence)
This table summarises service age groups for Grantham Farm in 2021 for persons, with comparison against Blacktown (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Grantham Farm, with comparison markers for Blacktown (C).
Babies and pre-schoolers (0 to 4)
2021 count
503
% of total
13.7%
Change from 2016
+6.3pp
503
13.7%
+6.3pp
Primary schoolers (5 to 11)
2021 count
385
% of total
10.5%
Change from 2016
+0.4pp
385
10.5%
+0.4pp
Secondary schoolers (12 to 17)
2021 count
232
% of total
6.3%
Change from 2016
-2.1pp
232
6.3%
-2.1pp
Tertiary education and independence (18 to 24)
2021 count
269
% of total
7.3%
Change from 2016
-1.5pp
269
7.3%
-1.5pp
Young workforce (25 to 34)
2021 count
894
% of total
24.4%
Change from 2016
+8.2pp
894
24.4%
+8.2pp
Parents and homebuilders (35 to 49)
2021 count
934
% of total
25.5%
Change from 2016
+4.1pp
934
25.5%
+4.1pp
Older workers and pre-retirees (50 to 59)
2021 count
257
% of total
7.0%
Change from 2016
-4.4pp
257
7.0%
-4.4pp
Empty nesters and retirees (60 to 69)
2021 count
149
% of total
4.1%
Change from 2016
-4.5pp
149
4.1%
-4.5pp
Seniors (70 to 84)
2021 count
73
% of total
2.0%
Change from 2016
-4.6pp
73
2.0%
-4.6pp
Elderly aged (85 and over)
2021 count
10
% of total
0.3%
Change from 2016
-0.8pp
10
0.3%
-0.8pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+439
+6.3pp
Primary schoolers (5 to 11)
+299
+0.4pp
Secondary schoolers (12 to 17)
+160
-2.1pp
Tertiary education and independence (18 to 24)
+194
-1.5pp
Young workforce (25 to 34)
+755
+8.2pp
Parents and homebuilders (35 to 49)
+750
+4.1pp
Older workers and pre-retirees (50 to 59)
+159
-4.4pp
Empty nesters and retirees (60 to 69)
+75
-4.5pp
Seniors (70 to 84)
+16
-4.6pp
Elderly aged (85 and over)
+1
-0.8pp
Data table
Service age groups for Grantham Farm. 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) | 503 | 13.7% | 7.5% | 64 | 7.4% | 8.0% | +439 | +6.3pp |
| Primary schoolers (5 to 11) | 385 | 10.5% | 10.9% | 86 | 10.1% | 10.8% | +299 | +0.4pp |
| Secondary schoolers (12 to 17) | 232 | 6.3% | 8.0% | 72 | 8.4% | 8.2% | +160 | -2.1pp |
| Tertiary education and independence (18 to 24) | 269 | 7.3% | 9.1% | 75 | 8.8% | 9.5% | +194 | -1.5pp |
| Young workforce (25 to 34) | 894 | 24.4% | 14.9% | 139 | 16.2% | 15.5% | +755 | +8.2pp |
| Parents and homebuilders (35 to 49) | 934 | 25.5% | 23.4% | 184 | 21.4% | 21.7% | +750 | +4.1pp |
| Older workers and pre-retirees (50 to 59) | 257 | 7.0% | 10.7% | 98 | 11.4% | 11.4% | +159 | -4.4pp |
| Empty nesters and retirees (60 to 69) | 149 | 4.1% | 8.2% | 74 | 8.6% | 8.4% | +75 | -4.5pp |
| Seniors (70 to 84) | 73 | 2.0% | 6.2% | 57 | 6.6% | 5.4% | +16 | -4.6pp |
| Elderly aged (85 and over) | 10 | 0.3% | 1.1% | 9 | 1.1% | 1.1% | +1 | -0.8pp |
| Total | 3,669 | 100.0% | 100.0% | 859 | 100.0% | 100.0% | +2,810 | 0.0pp |