Population
Service age groups
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.
Related topics
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.
Key insight
In 2021, Mid-life adults (35 to 49) was the most common category among residents in Christies Beach, accounting for 18.6% (1,111 people). This share was lower than Onkaparinga (C) (19.2%). Since 2016, the biggest change was in Early career adults (25 to 34), which increased by 256 people and 3 percentage points.
Section overview
Age structure - Service age groups
Christies Beach - Total persons (Usual residence)
This table summarises service age groups for Christies Beach in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
This area boundary has changed from 2016 to 2021. As a result, 2016 values are mapped onto 2021 suburb boundaries using ABS concordance.
Age structure - Service age groups snapshot
2021 distribution by category for Christies Beach, with comparison markers for Onkaparinga (C).
Early childhood (0 to 4)
Primary school age (5 to 11)
Secondary school age (12 to 17)
Young adults (18 to 24)
Early career adults (25 to 34)
Mid-life adults (35 to 49)
Pre-retirement adults (50 to 59)
Retirement transition (60 to 69)
Established seniors (70 to 84)
Advanced age (85 years and over)
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Early childhood (0 to 4)
+27
-0.1pp
Primary school age (5 to 11)
-6
-0.8pp
Secondary school age (12 to 17)
+1
-0.6pp
Young adults (18 to 24)
-16
-1.3pp
Early career adults (25 to 34)
+256
+3.0pp
Mid-life adults (35 to 49)
+128
+0.3pp
Pre-retirement adults (50 to 59)
+110
+0.6pp
Retirement transition (60 to 69)
+39
-0.4pp
Established seniors (70 to 84)
+47
-0.3pp
Advanced age (85 years and over)
-12
-0.6pp
Data table
Service age groups for Christies Beach. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Onkaparinga (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Onkaparinga (C)% | Count | % | Onkaparinga (C)% | Count | pp | |
| Early childhood (0 to 4) | 351 | 5.9% | 5.4% | 324 | 6.0% | 6.2% | +27 | -0.1pp |
| Primary school age (5 to 11) | 416 | 7.0% | 8.6% | 422 | 7.8% | 8.9% | -6 | -0.8pp |
| Secondary school age (12 to 17) | 362 | 6.1% | 7.3% | 361 | 6.7% | 7.5% | +1 | -0.6pp |
| Young adults (18 to 24) | 526 | 8.8% | 7.9% | 542 | 10.1% | 8.4% | -16 | -1.3pp |
| Early career adults (25 to 34) | 960 | 16.1% | 12.2% | 704 | 13.1% | 12.4% | +256 | +3.0pp |
| Mid-life adults (35 to 49) | 1,111 | 18.6% | 19.2% | 983 | 18.3% | 19.7% | +128 | +0.3pp |
| Pre-retirement adults (50 to 59) | 783 | 13.1% | 13.1% | 673 | 12.5% | 13.3% | +110 | +0.6pp |
| Retirement transition (60 to 69) | 638 | 10.7% | 12.3% | 599 | 11.1% | 12.4% | +39 | -0.4pp |
| Established seniors (70 to 84) | 659 | 11.1% | 11.8% | 612 | 11.4% | 9.1% | +47 | -0.3pp |
| Advanced age (85 years and over) | 181 | 3.0% | 2.2% | 193 | 3.6% | 2.1% | -12 | -0.6pp |
| Total | 5,962 | 100.0% | 100.0% | 5,384 | 100.0% | 100.0% | +578 | 0.0pp |