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 Port Noarlunga, accounting for 18.6% (602 people). This share was lower than Onkaparinga (C) (19.2%). Since 2016, the biggest change was in Young workforce (25 to 34), which increased by 101 people and 2.3 percentage points.
Section overview
Age structure - Service age groups
Port Noarlunga - Total persons (Usual residence)
This table summarises service age groups for Port Noarlunga in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Port Noarlunga, with comparison markers for Onkaparinga (C).
Babies and pre-schoolers (0 to 4)
2021 count
138
% of total
4.3%
Change from 2016
-0.3pp
138
4.3%
-0.3pp
Primary schoolers (5 to 11)
2021 count
230
% of total
7.1%
Change from 2016
-1.3pp
230
7.1%
-1.3pp
Secondary schoolers (12 to 17)
2021 count
229
% of total
7.1%
Change from 2016
+0.4pp
229
7.1%
+0.4pp
Tertiary education and independence (18 to 24)
2021 count
231
% of total
7.1%
Change from 2016
-0.1pp
231
7.1%
-0.1pp
Young workforce (25 to 34)
2021 count
387
% of total
11.9%
Change from 2016
+2.3pp
387
11.9%
+2.3pp
Parents and homebuilders (35 to 49)
2021 count
602
% of total
18.6%
Change from 2016
-1.7pp
602
18.6%
-1.7pp
Older workers and pre-retirees (50 to 59)
2021 count
481
% of total
14.8%
Change from 2016
+0.5pp
481
14.8%
+0.5pp
Empty nesters and retirees (60 to 69)
2021 count
441
% of total
13.6%
Change from 2016
+0.8pp
441
13.6%
+0.8pp
Seniors (70 to 84)
2021 count
379
% of total
11.7%
Change from 2016
-0.2pp
379
11.7%
-0.2pp
Elderly aged (85 and over)
2021 count
147
% of total
4.5%
Change from 2016
+0.6pp
147
4.5%
+0.6pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
0
-0.3pp
Primary schoolers (5 to 11)
-21
-1.3pp
Secondary schoolers (12 to 17)
+29
+0.4pp
Tertiary education and independence (18 to 24)
+16
-0.1pp
Young workforce (25 to 34)
+101
+2.3pp
Parents and homebuilders (35 to 49)
-4
-1.7pp
Older workers and pre-retirees (50 to 59)
+56
+0.5pp
Empty nesters and retirees (60 to 69)
+58
+0.8pp
Seniors (70 to 84)
+24
-0.2pp
Elderly aged (85 and over)
+31
+0.6pp
Data table
Service age groups for Port Noarlunga. 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) | 138 | 4.3% | 5.4% | 138 | 4.6% | 6.2% | 0 | -0.3pp |
| Primary schoolers (5 to 11) | 230 | 7.1% | 8.6% | 251 | 8.4% | 8.9% | -21 | -1.3pp |
| Secondary schoolers (12 to 17) | 229 | 7.1% | 7.3% | 200 | 6.7% | 7.5% | +29 | +0.4pp |
| Tertiary education and independence (18 to 24) | 231 | 7.1% | 7.9% | 215 | 7.2% | 8.4% | +16 | -0.1pp |
| Young workforce (25 to 34) | 387 | 11.9% | 12.2% | 286 | 9.6% | 12.4% | +101 | +2.3pp |
| Parents and homebuilders (35 to 49) | 602 | 18.6% | 19.2% | 606 | 20.3% | 19.7% | -4 | -1.7pp |
| Older workers and pre-retirees (50 to 59) | 481 | 14.8% | 13.1% | 425 | 14.3% | 13.3% | +56 | +0.5pp |
| Empty nesters and retirees (60 to 69) | 441 | 13.6% | 12.3% | 383 | 12.8% | 12.4% | +58 | +0.8pp |
| Seniors (70 to 84) | 379 | 11.7% | 11.8% | 355 | 11.9% | 9.1% | +24 | -0.2pp |
| Elderly aged (85 and over) | 147 | 4.5% | 2.2% | 116 | 3.9% | 2.1% | +31 | +0.6pp |
| Total | 3,245 | 100.0% | 100.0% | 2,979 | 100.0% | 100.0% | +266 | 0.0pp |