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 South, accounting for 20.9% (639 people). This share was higher than Onkaparinga (C) (19.2%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 98 people and 2.3 percentage points.
Section overview
Age structure - Service age groups
Port Noarlunga South - Total persons (Usual residence)
This table summarises service age groups for Port Noarlunga South 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 South, with comparison markers for Onkaparinga (C).
Babies and pre-schoolers (0 to 4)
2021 count
194
% of total
6.3%
Change from 2016
+0.5pp
194
6.3%
+0.5pp
Primary schoolers (5 to 11)
2021 count
285
% of total
9.3%
Change from 2016
+1.4pp
285
9.3%
+1.4pp
Secondary schoolers (12 to 17)
2021 count
200
% of total
6.5%
Change from 2016
-0.4pp
200
6.5%
-0.4pp
Tertiary education and independence (18 to 24)
2021 count
220
% of total
7.2%
Change from 2016
-1.3pp
220
7.2%
-1.3pp
Young workforce (25 to 34)
2021 count
417
% of total
13.6%
Change from 2016
+0.8pp
417
13.6%
+0.8pp
Parents and homebuilders (35 to 49)
2021 count
639
% of total
20.9%
Change from 2016
-1.7pp
639
20.9%
-1.7pp
Older workers and pre-retirees (50 to 59)
2021 count
385
% of total
12.6%
Change from 2016
+0.2pp
385
12.6%
+0.2pp
Empty nesters and retirees (60 to 69)
2021 count
370
% of total
12.1%
Change from 2016
-1.8pp
370
12.1%
-1.8pp
Seniors (70 to 84)
2021 count
331
% of total
10.8%
Change from 2016
+2.3pp
331
10.8%
+2.3pp
Elderly aged (85 and over)
2021 count
43
% of total
1.4%
Change from 2016
+0.1pp
43
1.4%
+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)
+35
+0.5pp
Primary schoolers (5 to 11)
+68
+1.4pp
Secondary schoolers (12 to 17)
+10
-0.4pp
Tertiary education and independence (18 to 24)
-12
-1.3pp
Young workforce (25 to 34)
+67
+0.8pp
Parents and homebuilders (35 to 49)
+22
-1.7pp
Older workers and pre-retirees (50 to 59)
+47
+0.2pp
Empty nesters and retirees (60 to 69)
-10
-1.8pp
Seniors (70 to 84)
+98
+2.3pp
Elderly aged (85 and over)
+8
+0.1pp
Data table
Service age groups for Port Noarlunga South. 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) | 194 | 6.3% | 5.4% | 159 | 5.8% | 6.2% | +35 | +0.5pp |
| Primary schoolers (5 to 11) | 285 | 9.3% | 8.6% | 217 | 7.9% | 8.9% | +68 | +1.4pp |
| Secondary schoolers (12 to 17) | 200 | 6.5% | 7.3% | 190 | 6.9% | 7.5% | +10 | -0.4pp |
| Tertiary education and independence (18 to 24) | 220 | 7.2% | 7.9% | 232 | 8.5% | 8.4% | -12 | -1.3pp |
| Young workforce (25 to 34) | 417 | 13.6% | 12.2% | 350 | 12.8% | 12.4% | +67 | +0.8pp |
| Parents and homebuilders (35 to 49) | 639 | 20.9% | 19.2% | 617 | 22.6% | 19.7% | +22 | -1.7pp |
| Older workers and pre-retirees (50 to 59) | 385 | 12.6% | 13.1% | 338 | 12.4% | 13.3% | +47 | +0.2pp |
| Empty nesters and retirees (60 to 69) | 370 | 12.1% | 12.3% | 380 | 13.9% | 12.4% | -10 | -1.8pp |
| Seniors (70 to 84) | 331 | 10.8% | 11.8% | 233 | 8.5% | 9.1% | +98 | +2.3pp |
| Elderly aged (85 and over) | 43 | 1.4% | 2.2% | 35 | 1.3% | 2.1% | +8 | +0.1pp |
| Total | 3,058 | 100.0% | 100.0% | 2,734 | 100.0% | 100.0% | +324 | 0.0pp |