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 Blewitt Springs, accounting for 18.8% (65 people). This share was lower than Onkaparinga (C) (19.2%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which increased by 65 people and 18.8 percentage points.
Section overview
Age structure - Service age groups
Blewitt Springs - Total persons (Usual residence)
This table summarises service age groups for Blewitt Springs in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Blewitt Springs, with comparison markers for Onkaparinga (C).
Babies and pre-schoolers (0 to 4)
2021 count
4
% of total
1.2%
Change from 2016
+1.2pp
4
1.2%
+1.2pp
Primary schoolers (5 to 11)
2021 count
31
% of total
9.0%
Change from 2016
+9.0pp
31
9.0%
+9.0pp
Secondary schoolers (12 to 17)
2021 count
25
% of total
7.2%
Change from 2016
+7.2pp
25
7.2%
+7.2pp
Tertiary education and independence (18 to 24)
2021 count
24
% of total
6.9%
Change from 2016
+6.9pp
24
6.9%
+6.9pp
Young workforce (25 to 34)
2021 count
14
% of total
4.0%
Change from 2016
+4.0pp
14
4.0%
+4.0pp
Parents and homebuilders (35 to 49)
2021 count
65
% of total
18.8%
Change from 2016
+18.8pp
65
18.8%
+18.8pp
Older workers and pre-retirees (50 to 59)
2021 count
60
% of total
17.3%
Change from 2016
+7.6pp
60
17.3%
+7.6pp
Empty nesters and retirees (60 to 69)
2021 count
61
% of total
17.6%
Change from 2016
-11.4pp
61
17.6%
-11.4pp
Seniors (70 to 84)
2021 count
56
% of total
16.2%
Change from 2016
-3.2pp
56
16.2%
-3.2pp
Elderly aged (85 and over)
2021 count
0
% of total
0.0%
Change from 2016
0.0pp
0
0.0%
0.0pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+4
+1.2pp
Primary schoolers (5 to 11)
+31
+9.0pp
Secondary schoolers (12 to 17)
+25
+7.2pp
Tertiary education and independence (18 to 24)
+24
+6.9pp
Young workforce (25 to 34)
+14
+4.0pp
Parents and homebuilders (35 to 49)
+65
+18.8pp
Older workers and pre-retirees (50 to 59)
+57
+7.6pp
Empty nesters and retirees (60 to 69)
+52
-11.4pp
Seniors (70 to 84)
+50
-3.2pp
Elderly aged (85 and over)
0
0.0pp
Data table
Service age groups for Blewitt Springs. 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) | 4 | 1.2% | 5.4% | 0 | 0.0% | 6.2% | +4 | +1.2pp |
| Primary schoolers (5 to 11) | 31 | 9.0% | 8.6% | 0 | 0.0% | 8.9% | +31 | +9.0pp |
| Secondary schoolers (12 to 17) | 25 | 7.2% | 7.3% | 0 | 0.0% | 7.5% | +25 | +7.2pp |
| Tertiary education and independence (18 to 24) | 24 | 6.9% | 7.9% | 0 | 0.0% | 8.4% | +24 | +6.9pp |
| Young workforce (25 to 34) | 14 | 4.0% | 12.2% | 0 | 0.0% | 12.4% | +14 | +4.0pp |
| Parents and homebuilders (35 to 49) | 65 | 18.8% | 19.2% | 0 | 0.0% | 19.7% | +65 | +18.8pp |
| Older workers and pre-retirees (50 to 59) | 60 | 17.3% | 13.1% | 3 | 9.7% | 13.3% | +57 | +7.6pp |
| Empty nesters and retirees (60 to 69) | 61 | 17.6% | 12.3% | 9 | 29.0% | 12.4% | +52 | -11.4pp |
| Seniors (70 to 84) | 56 | 16.2% | 11.8% | 6 | 19.4% | 9.1% | +50 | -3.2pp |
| Elderly aged (85 and over) | 0 | 0.0% | 2.2% | 0 | 0.0% | 2.1% | 0 | 0.0pp |
| Total | 346 | 100.0% | 100.0% | 31 | 100.0% | 100.0% | +315 | 0.0pp |