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 Christie Downs, accounting for 19.4% (1,015 people). This share was similar to Onkaparinga (C) (19.2%). Since 2016, the biggest change was in Empty nesters and retirees (60 to 69), which decreased by 147 people and 2.7 percentage points.
Section overview
Age structure - Service age groups
Christie Downs - Total persons (Usual residence)
This table summarises service age groups for Christie Downs in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Christie Downs, with comparison markers for Onkaparinga (C).
Babies and pre-schoolers (0 to 4)
2021 count
256
% of total
4.9%
Change from 2016
-1.8pp
256
4.9%
-1.8pp
Primary schoolers (5 to 11)
2021 count
445
% of total
8.5%
Change from 2016
+0.3pp
445
8.5%
+0.3pp
Secondary schoolers (12 to 17)
2021 count
362
% of total
6.9%
Change from 2016
-0.6pp
362
6.9%
-0.6pp
Tertiary education and independence (18 to 24)
2021 count
443
% of total
8.5%
Change from 2016
-0.1pp
443
8.5%
-0.1pp
Young workforce (25 to 34)
2021 count
650
% of total
12.4%
Change from 2016
-0.3pp
650
12.4%
-0.3pp
Parents and homebuilders (35 to 49)
2021 count
1,015
% of total
19.4%
Change from 2016
+1.1pp
1,015
19.4%
+1.1pp
Older workers and pre-retirees (50 to 59)
2021 count
632
% of total
12.1%
Change from 2016
+1.4pp
632
12.1%
+1.4pp
Empty nesters and retirees (60 to 69)
2021 count
577
% of total
11.0%
Change from 2016
-2.7pp
577
11.0%
-2.7pp
Seniors (70 to 84)
2021 count
710
% of total
13.6%
Change from 2016
+2.9pp
710
13.6%
+2.9pp
Elderly aged (85 and over)
2021 count
145
% of total
2.8%
Change from 2016
+0.1pp
145
2.8%
+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)
-100
-1.8pp
Primary schoolers (5 to 11)
+9
+0.3pp
Secondary schoolers (12 to 17)
-35
-0.6pp
Tertiary education and independence (18 to 24)
-10
-0.1pp
Young workforce (25 to 34)
-20
-0.3pp
Parents and homebuilders (35 to 49)
+47
+1.1pp
Older workers and pre-retirees (50 to 59)
+67
+1.4pp
Empty nesters and retirees (60 to 69)
-147
-2.7pp
Seniors (70 to 84)
+142
+2.9pp
Elderly aged (85 and over)
+2
+0.1pp
Data table
Service age groups for Christie Downs. 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 | |
| Babies and pre-schoolers (0 to 4) | 256 | 4.9% | 5.4% | 356 | 6.7% | 6.2% | -100 | -1.8pp |
| Primary schoolers (5 to 11) | 445 | 8.5% | 8.6% | 436 | 8.2% | 8.9% | +9 | +0.3pp |
| Secondary schoolers (12 to 17) | 362 | 6.9% | 7.3% | 397 | 7.5% | 7.5% | -35 | -0.6pp |
| Tertiary education and independence (18 to 24) | 443 | 8.5% | 7.9% | 453 | 8.6% | 8.4% | -10 | -0.1pp |
| Young workforce (25 to 34) | 650 | 12.4% | 12.2% | 670 | 12.7% | 12.4% | -20 | -0.3pp |
| Parents and homebuilders (35 to 49) | 1,015 | 19.4% | 19.2% | 968 | 18.3% | 19.7% | +47 | +1.1pp |
| Older workers and pre-retirees (50 to 59) | 632 | 12.1% | 13.1% | 565 | 10.7% | 13.3% | +67 | +1.4pp |
| Empty nesters and retirees (60 to 69) | 577 | 11.0% | 12.3% | 724 | 13.7% | 12.4% | -147 | -2.7pp |
| Seniors (70 to 84) | 710 | 13.6% | 11.8% | 568 | 10.7% | 9.1% | +142 | +2.9pp |
| Elderly aged (85 and over) | 145 | 2.8% | 2.2% | 143 | 2.7% | 2.1% | +2 | +0.1pp |
| Total | 5,239 | 100.0% | 100.0% | 5,289 | 100.0% | 100.0% | -50 | 0.0pp |