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 Seaford Rise, accounting for 20.7% (1,265 people). This share was higher than Onkaparinga (C) (19.2%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which increased by 1,026 people, while its share fell by 2.8 percentage points.
Section overview
Age structure - Service age groups
Seaford Rise - Total persons (Usual residence)
This table summarises service age groups for Seaford Rise in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Seaford Rise, with comparison markers for Onkaparinga (C).
Babies and pre-schoolers (0 to 4)
2021 count
354
% of total
5.8%
Change from 2016
+0.3pp
354
5.8%
+0.3pp
Primary schoolers (5 to 11)
2021 count
647
% of total
10.6%
Change from 2016
+2.2pp
647
10.6%
+2.2pp
Secondary schoolers (12 to 17)
2021 count
536
% of total
8.8%
Change from 2016
+2.8pp
536
8.8%
+2.8pp
Tertiary education and independence (18 to 24)
2021 count
486
% of total
8.0%
Change from 2016
+1.5pp
486
8.0%
+1.5pp
Young workforce (25 to 34)
2021 count
639
% of total
10.5%
Change from 2016
+0.8pp
639
10.5%
+0.8pp
Parents and homebuilders (35 to 49)
2021 count
1,265
% of total
20.7%
Change from 2016
-2.8pp
1,265
20.7%
-2.8pp
Older workers and pre-retirees (50 to 59)
2021 count
860
% of total
14.1%
Change from 2016
-0.4pp
860
14.1%
-0.4pp
Empty nesters and retirees (60 to 69)
2021 count
624
% of total
10.2%
Change from 2016
-1.0pp
624
10.2%
-1.0pp
Seniors (70 to 84)
2021 count
600
% of total
9.8%
Change from 2016
-0.4pp
600
9.8%
-0.4pp
Elderly aged (85 and over)
2021 count
97
% of total
1.6%
Change from 2016
-1.3pp
97
1.6%
-1.3pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+298
+0.3pp
Primary schoolers (5 to 11)
+561
+2.2pp
Secondary schoolers (12 to 17)
+475
+2.8pp
Tertiary education and independence (18 to 24)
+420
+1.5pp
Young workforce (25 to 34)
+540
+0.8pp
Parents and homebuilders (35 to 49)
+1,026
-2.8pp
Older workers and pre-retirees (50 to 59)
+712
-0.4pp
Empty nesters and retirees (60 to 69)
+510
-1.0pp
Seniors (70 to 84)
+496
-0.4pp
Elderly aged (85 and over)
+67
-1.3pp
Data table
Service age groups for Seaford Rise. 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) | 354 | 5.8% | 5.4% | 56 | 5.5% | 6.2% | +298 | +0.3pp |
| Primary schoolers (5 to 11) | 647 | 10.6% | 8.6% | 86 | 8.4% | 8.9% | +561 | +2.2pp |
| Secondary schoolers (12 to 17) | 536 | 8.8% | 7.3% | 61 | 6.0% | 7.5% | +475 | +2.8pp |
| Tertiary education and independence (18 to 24) | 486 | 8.0% | 7.9% | 66 | 6.5% | 8.4% | +420 | +1.5pp |
| Young workforce (25 to 34) | 639 | 10.5% | 12.2% | 99 | 9.7% | 12.4% | +540 | +0.8pp |
| Parents and homebuilders (35 to 49) | 1,265 | 20.7% | 19.2% | 239 | 23.5% | 19.7% | +1,026 | -2.8pp |
| Older workers and pre-retirees (50 to 59) | 860 | 14.1% | 13.1% | 148 | 14.5% | 13.3% | +712 | -0.4pp |
| Empty nesters and retirees (60 to 69) | 624 | 10.2% | 12.3% | 114 | 11.2% | 12.4% | +510 | -1.0pp |
| Seniors (70 to 84) | 600 | 9.8% | 11.8% | 104 | 10.2% | 9.1% | +496 | -0.4pp |
| Elderly aged (85 and over) | 97 | 1.6% | 2.2% | 30 | 2.9% | 2.1% | +67 | -1.3pp |
| Total | 6,105 | 100.0% | 100.0% | 1,019 | 100.0% | 100.0% | +5,086 | 0.0pp |