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, Seniors (70 to 84) was the most common category among residents in Derriwong (part), accounting for 15.8% (6 people). This share was higher than Lachlan (A) (11.9%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 6 people and 15.8 percentage points.
Section overview
Age structure - Service age groups
Derriwong (part) - Total persons (Usual residence)
This table summarises service age groups for Derriwong (part) in 2021 for persons, with comparison against Lachlan (A) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Derriwong (part), with comparison markers for Lachlan (A).
Babies and pre-schoolers (0 to 4)
Primary schoolers (5 to 11)
Secondary schoolers (12 to 17)
Tertiary education and independence (18 to 24)
Young workforce (25 to 34)
Parents and homebuilders (35 to 49)
Older workers and pre-retirees (50 to 59)
Empty nesters and retirees (60 to 69)
Seniors (70 to 84)
Elderly aged (85 and over)
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
0
0.0pp
Primary schoolers (5 to 11)
0
0.0pp
Secondary schoolers (12 to 17)
0
0.0pp
Tertiary education and independence (18 to 24)
0
0.0pp
Young workforce (25 to 34)
0
0.0pp
Parents and homebuilders (35 to 49)
-5
-13.2pp
Older workers and pre-retirees (50 to 59)
0
0.0pp
Empty nesters and retirees (60 to 69)
0
0.0pp
Seniors (70 to 84)
+6
+15.8pp
Elderly aged (85 and over)
0
0.0pp
Data table
Service age groups for Derriwong (part). Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Lachlan (A).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Lachlan (A)% | Count | % | Lachlan (A)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 0 | 0.0% | 6.6% | 0 | 0.0% | 8.0% | 0 | 0.0pp |
| Primary schoolers (5 to 11) | 3 | 7.9% | 11.0% | 3 | 7.9% | 10.1% | 0 | 0.0pp |
| Secondary schoolers (12 to 17) | 3 | 7.9% | 7.1% | 3 | 7.9% | 6.8% | 0 | 0.0pp |
| Tertiary education and independence (18 to 24) | 0 | 0.0% | 6.2% | 0 | 0.0% | 7.7% | 0 | 0.0pp |
| Young workforce (25 to 34) | 0 | 0.0% | 11.6% | 0 | 0.0% | 12.0% | 0 | 0.0pp |
| Parents and homebuilders (35 to 49) | 3 | 7.9% | 17.1% | 8 | 21.1% | 15.6% | -5 | -13.2pp |
| Older workers and pre-retirees (50 to 59) | 3 | 7.9% | 11.8% | 3 | 7.9% | 13.3% | 0 | 0.0pp |
| Empty nesters and retirees (60 to 69) | 0 | 0.0% | 13.6% | 0 | 0.0% | 12.1% | 0 | 0.0pp |
| Seniors (70 to 84) | 6 | 15.8% | 11.9% | 0 | 0.0% | 11.9% | +6 | +15.8pp |
| Elderly aged (85 and over) | 0 | 0.0% | 3.4% | 0 | 0.0% | 2.7% | 0 | 0.0pp |
| Total | 38 | 100.0% | 100.0% | 38 | 100.0% | 100.0% | 0 | 0.0pp |