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 Old Reynella, accounting for 18.8% (651 people). This share was lower than Onkaparinga (C) (19.2%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 100 people and 2.7 percentage points.
Section overview
Age structure - Service age groups
Old Reynella - Total persons (Usual residence)
This table summarises service age groups for Old Reynella in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Old Reynella, with comparison markers for Onkaparinga (C).
Babies and pre-schoolers (0 to 4)
2021 count
183
% of total
5.3%
Change from 2016
-1.3pp
183
5.3%
-1.3pp
Primary schoolers (5 to 11)
2021 count
290
% of total
8.4%
Change from 2016
+0.6pp
290
8.4%
+0.6pp
Secondary schoolers (12 to 17)
2021 count
227
% of total
6.6%
Change from 2016
-0.9pp
227
6.6%
-0.9pp
Tertiary education and independence (18 to 24)
2021 count
300
% of total
8.7%
Change from 2016
+0.5pp
300
8.7%
+0.5pp
Young workforce (25 to 34)
2021 count
401
% of total
11.6%
Change from 2016
-2.1pp
401
11.6%
-2.1pp
Parents and homebuilders (35 to 49)
2021 count
651
% of total
18.8%
Change from 2016
-0.5pp
651
18.8%
-0.5pp
Older workers and pre-retirees (50 to 59)
2021 count
442
% of total
12.8%
Change from 2016
-0.2pp
442
12.8%
-0.2pp
Empty nesters and retirees (60 to 69)
2021 count
420
% of total
12.1%
Change from 2016
+0.8pp
420
12.1%
+0.8pp
Seniors (70 to 84)
2021 count
393
% of total
11.4%
Change from 2016
+2.7pp
393
11.4%
+2.7pp
Elderly aged (85 and over)
2021 count
157
% of total
4.5%
Change from 2016
+0.5pp
157
4.5%
+0.5pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-40
-1.3pp
Primary schoolers (5 to 11)
+27
+0.6pp
Secondary schoolers (12 to 17)
-27
-0.9pp
Tertiary education and independence (18 to 24)
+23
+0.5pp
Young workforce (25 to 34)
-64
-2.1pp
Parents and homebuilders (35 to 49)
-1
-0.5pp
Older workers and pre-retirees (50 to 59)
+3
-0.2pp
Empty nesters and retirees (60 to 69)
+39
+0.8pp
Seniors (70 to 84)
+100
+2.7pp
Elderly aged (85 and over)
+22
+0.5pp
Data table
Service age groups for Old Reynella. 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) | 183 | 5.3% | 5.4% | 223 | 6.6% | 6.2% | -40 | -1.3pp |
| Primary schoolers (5 to 11) | 290 | 8.4% | 8.6% | 263 | 7.8% | 8.9% | +27 | +0.6pp |
| Secondary schoolers (12 to 17) | 227 | 6.6% | 7.3% | 254 | 7.5% | 7.5% | -27 | -0.9pp |
| Tertiary education and independence (18 to 24) | 300 | 8.7% | 7.9% | 277 | 8.2% | 8.4% | +23 | +0.5pp |
| Young workforce (25 to 34) | 401 | 11.6% | 12.2% | 465 | 13.7% | 12.4% | -64 | -2.1pp |
| Parents and homebuilders (35 to 49) | 651 | 18.8% | 19.2% | 652 | 19.3% | 19.7% | -1 | -0.5pp |
| Older workers and pre-retirees (50 to 59) | 442 | 12.8% | 13.1% | 439 | 13.0% | 13.3% | +3 | -0.2pp |
| Empty nesters and retirees (60 to 69) | 420 | 12.1% | 12.3% | 381 | 11.3% | 12.4% | +39 | +0.8pp |
| Seniors (70 to 84) | 393 | 11.4% | 11.8% | 293 | 8.7% | 9.1% | +100 | +2.7pp |
| Elderly aged (85 and over) | 157 | 4.5% | 2.2% | 135 | 4.0% | 2.1% | +22 | +0.5pp |
| Total | 3,458 | 100.0% | 100.0% | 3,383 | 100.0% | 100.0% | +75 | 0.0pp |