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 Tumby Bay (DC), accounting for 18% (506 people). This share was higher than Regional SA (14.7%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 91 people and 2.1 percentage points.
Section overview
Age structure - Service age groups
Tumby Bay (DC) - Total persons (Usual residence)
This table summarises service age groups for Tumby Bay (DC) in 2021 for persons, with comparison against Regional SA and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Tumby Bay (DC), with comparison markers for Regional SA.
Babies and pre-schoolers (0 to 4)
2021 count
164
% of total
5.8%
Change from 2016
+0.5pp
164
5.8%
+0.5pp
Primary schoolers (5 to 11)
2021 count
229
% of total
8.1%
Change from 2016
+0.1pp
229
8.1%
+0.1pp
Secondary schoolers (12 to 17)
2021 count
167
% of total
5.9%
Change from 2016
-0.3pp
167
5.9%
-0.3pp
Tertiary education and independence (18 to 24)
2021 count
99
% of total
3.5%
Change from 2016
-1.8pp
99
3.5%
-1.8pp
Young workforce (25 to 34)
2021 count
233
% of total
8.3%
Change from 2016
-0.5pp
233
8.3%
-0.5pp
Parents and homebuilders (35 to 49)
2021 count
419
% of total
14.9%
Change from 2016
-1.0pp
419
14.9%
-1.0pp
Older workers and pre-retirees (50 to 59)
2021 count
393
% of total
14.0%
Change from 2016
-1.2pp
393
14.0%
-1.2pp
Empty nesters and retirees (60 to 69)
2021 count
490
% of total
17.4%
Change from 2016
+0.8pp
490
17.4%
+0.8pp
Seniors (70 to 84)
2021 count
506
% of total
18.0%
Change from 2016
+2.1pp
506
18.0%
+2.1pp
Elderly aged (85 and over)
2021 count
121
% of total
4.3%
Change from 2016
+1.0pp
121
4.3%
+1.0pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+26
+0.5pp
Primary schoolers (5 to 11)
+21
+0.1pp
Secondary schoolers (12 to 17)
+6
-0.3pp
Tertiary education and independence (18 to 24)
-39
-1.8pp
Young workforce (25 to 34)
+3
-0.5pp
Parents and homebuilders (35 to 49)
+5
-1.0pp
Older workers and pre-retirees (50 to 59)
-4
-1.2pp
Empty nesters and retirees (60 to 69)
+57
+0.8pp
Seniors (70 to 84)
+91
+2.1pp
Elderly aged (85 and over)
+35
+1.0pp
Data table
Service age groups for Tumby Bay (DC). Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Regional SA.
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Regional SA% | Count | % | Regional SA% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 164 | 5.8% | 4.9% | 138 | 5.3% | 5.5% | +26 | +0.5pp |
| Primary schoolers (5 to 11) | 229 | 8.1% | 8.1% | 208 | 8.0% | 8.6% | +21 | +0.1pp |
| Secondary schoolers (12 to 17) | 167 | 5.9% | 7.0% | 161 | 6.2% | 7.2% | +6 | -0.3pp |
| Tertiary education and independence (18 to 24) | 99 | 3.5% | 6.5% | 138 | 5.3% | 6.8% | -39 | -1.8pp |
| Young workforce (25 to 34) | 233 | 8.3% | 10.5% | 230 | 8.8% | 10.4% | +3 | -0.5pp |
| Parents and homebuilders (35 to 49) | 419 | 14.9% | 16.4% | 414 | 15.9% | 17.8% | +5 | -1.0pp |
| Older workers and pre-retirees (50 to 59) | 393 | 14.0% | 13.9% | 397 | 15.2% | 14.6% | -4 | -1.2pp |
| Empty nesters and retirees (60 to 69) | 490 | 17.4% | 15.1% | 433 | 16.6% | 14.4% | +57 | +0.8pp |
| Seniors (70 to 84) | 506 | 18.0% | 14.7% | 415 | 15.9% | 12.1% | +91 | +2.1pp |
| Elderly aged (85 and over) | 121 | 4.3% | 2.8% | 86 | 3.3% | 2.7% | +35 | +1.0pp |
| Total | 2,817 | 100.0% | 100.0% | 2,610 | 100.0% | 100.0% | +207 | 0.0pp |