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 Oakhurst (NSW), accounting for 20.3% (1,410 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 increased by 162 people and 2.3 percentage points.
Section overview
Age structure - Service age groups
Oakhurst (NSW) - Total persons (Usual residence)
This table summarises service age groups for Oakhurst (NSW) in 2021 for persons, with comparison against Blacktown (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Oakhurst (NSW), with comparison markers for Blacktown (C).
Babies and pre-schoolers (0 to 4)
2021 count
431
% of total
6.2%
Change from 2016
-0.8pp
431
6.2%
-0.8pp
Primary schoolers (5 to 11)
2021 count
723
% of total
10.4%
Change from 2016
-0.1pp
723
10.4%
-0.1pp
Secondary schoolers (12 to 17)
2021 count
600
% of total
8.6%
Change from 2016
-1.8pp
600
8.6%
-1.8pp
Tertiary education and independence (18 to 24)
2021 count
757
% of total
10.9%
Change from 2016
-0.9pp
757
10.9%
-0.9pp
Young workforce (25 to 34)
2021 count
997
% of total
14.4%
Change from 2016
0.0pp
997
14.4%
0.0pp
Parents and homebuilders (35 to 49)
2021 count
1,410
% of total
20.3%
Change from 2016
-0.3pp
1,410
20.3%
-0.3pp
Older workers and pre-retirees (50 to 59)
2021 count
938
% of total
13.5%
Change from 2016
-0.6pp
938
13.5%
-0.6pp
Empty nesters and retirees (60 to 69)
2021 count
696
% of total
10.0%
Change from 2016
+2.3pp
696
10.0%
+2.3pp
Seniors (70 to 84)
2021 count
359
% of total
5.2%
Change from 2016
+1.8pp
359
5.2%
+1.8pp
Elderly aged (85 and over)
2021 count
41
% of total
0.6%
Change from 2016
+0.2pp
41
0.6%
+0.2pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-54
-0.8pp
Primary schoolers (5 to 11)
-6
-0.1pp
Secondary schoolers (12 to 17)
-122
-1.8pp
Tertiary education and independence (18 to 24)
-64
-0.9pp
Young workforce (25 to 34)
-6
0.0pp
Parents and homebuilders (35 to 49)
-22
-0.3pp
Older workers and pre-retirees (50 to 59)
-40
-0.6pp
Empty nesters and retirees (60 to 69)
+162
+2.3pp
Seniors (70 to 84)
+122
+1.8pp
Elderly aged (85 and over)
+16
+0.2pp
Data table
Service age groups for Oakhurst (NSW). 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) | 431 | 6.2% | 7.5% | 485 | 7.0% | 8.0% | -54 | -0.8pp |
| Primary schoolers (5 to 11) | 723 | 10.4% | 10.9% | 729 | 10.5% | 10.8% | -6 | -0.1pp |
| Secondary schoolers (12 to 17) | 600 | 8.6% | 8.0% | 722 | 10.4% | 8.2% | -122 | -1.8pp |
| Tertiary education and independence (18 to 24) | 757 | 10.9% | 9.1% | 821 | 11.8% | 9.5% | -64 | -0.9pp |
| Young workforce (25 to 34) | 997 | 14.4% | 14.9% | 1,003 | 14.4% | 15.5% | -6 | 0.0pp |
| Parents and homebuilders (35 to 49) | 1,410 | 20.3% | 23.4% | 1,432 | 20.6% | 21.7% | -22 | -0.3pp |
| Older workers and pre-retirees (50 to 59) | 938 | 13.5% | 10.7% | 978 | 14.1% | 11.4% | -40 | -0.6pp |
| Empty nesters and retirees (60 to 69) | 696 | 10.0% | 8.2% | 534 | 7.7% | 8.4% | +162 | +2.3pp |
| Seniors (70 to 84) | 359 | 5.2% | 6.2% | 237 | 3.4% | 5.4% | +122 | +1.8pp |
| Elderly aged (85 and over) | 41 | 0.6% | 1.1% | 25 | 0.4% | 1.1% | +16 | +0.2pp |
| Total | 6,947 | 100.0% | 100.0% | 6,955 | 100.0% | 100.0% | -8 | 0.0pp |