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 Seaview Downs, accounting for 20.2% (548 people). This share was similar to Marion (C) (20.2%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which increased by 520 people, while its share fell by 3.1 percentage points.
Section overview
Age structure - Service age groups
Seaview Downs - Total persons (Usual residence)
This table summarises service age groups for Seaview Downs in 2021 for persons, with comparison against Marion (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Seaview Downs, with comparison markers for Marion (C).
Babies and pre-schoolers (0 to 4)
2021 count
150
% of total
5.5%
Change from 2016
+5.5pp
150
5.5%
+5.5pp
Primary schoolers (5 to 11)
2021 count
239
% of total
8.8%
Change from 2016
-2.0pp
239
8.8%
-2.0pp
Secondary schoolers (12 to 17)
2021 count
225
% of total
8.3%
Change from 2016
+3.3pp
225
8.3%
+3.3pp
Tertiary education and independence (18 to 24)
2021 count
202
% of total
7.4%
Change from 2016
+7.4pp
202
7.4%
+7.4pp
Young workforce (25 to 34)
2021 count
264
% of total
9.7%
Change from 2016
+9.7pp
264
9.7%
+9.7pp
Parents and homebuilders (35 to 49)
2021 count
548
% of total
20.2%
Change from 2016
-3.1pp
548
20.2%
-3.1pp
Older workers and pre-retirees (50 to 59)
2021 count
353
% of total
13.0%
Change from 2016
-5.3pp
353
13.0%
-5.3pp
Empty nesters and retirees (60 to 69)
2021 count
300
% of total
11.0%
Change from 2016
+2.7pp
300
11.0%
+2.7pp
Seniors (70 to 84)
2021 count
380
% of total
14.0%
Change from 2016
+7.3pp
380
14.0%
+7.3pp
Elderly aged (85 and over)
2021 count
63
% of total
2.3%
Change from 2016
+2.3pp
63
2.3%
+2.3pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+150
+5.5pp
Primary schoolers (5 to 11)
+226
-2.0pp
Secondary schoolers (12 to 17)
+219
+3.3pp
Tertiary education and independence (18 to 24)
+202
+7.4pp
Young workforce (25 to 34)
+264
+9.7pp
Parents and homebuilders (35 to 49)
+520
-3.1pp
Older workers and pre-retirees (50 to 59)
+331
-5.3pp
Empty nesters and retirees (60 to 69)
+290
+2.7pp
Seniors (70 to 84)
+372
+7.3pp
Elderly aged (85 and over)
+63
+2.3pp
Data table
Service age groups for Seaview Downs. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Marion (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Marion (C)% | Count | % | Marion (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 150 | 5.5% | 5.4% | 0 | 0.0% | 5.9% | +150 | +5.5pp |
| Primary schoolers (5 to 11) | 239 | 8.8% | 7.7% | 13 | 10.8% | 7.4% | +226 | -2.0pp |
| Secondary schoolers (12 to 17) | 225 | 8.3% | 6.1% | 6 | 5.0% | 6.1% | +219 | +3.3pp |
| Tertiary education and independence (18 to 24) | 202 | 7.4% | 8.8% | 0 | 0.0% | 9.6% | +202 | +7.4pp |
| Young workforce (25 to 34) | 264 | 9.7% | 15.1% | 0 | 0.0% | 14.8% | +264 | +9.7pp |
| Parents and homebuilders (35 to 49) | 548 | 20.2% | 20.2% | 28 | 23.3% | 19.5% | +520 | -3.1pp |
| Older workers and pre-retirees (50 to 59) | 353 | 13.0% | 11.7% | 22 | 18.3% | 13.0% | +331 | -5.3pp |
| Empty nesters and retirees (60 to 69) | 300 | 11.0% | 11.8% | 10 | 8.3% | 11.4% | +290 | +2.7pp |
| Seniors (70 to 84) | 380 | 14.0% | 10.4% | 8 | 6.7% | 9.1% | +372 | +7.3pp |
| Elderly aged (85 and over) | 63 | 2.3% | 2.9% | 0 | 0.0% | 3.1% | +63 | +2.3pp |
| Total | 2,718 | 100.0% | 100.0% | 120 | 100.0% | 100.0% | +2,598 | 0.0pp |