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 Sinagra, accounting for 22.3% (691 people). This share was higher than Wanneroo (C) (21.7%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which decreased by 967 people, while its share rose by 2.6 percentage points.
Section overview
Age structure - Service age groups
Sinagra - Total persons (Usual residence)
This table summarises service age groups for Sinagra in 2021 for persons, with comparison against Wanneroo (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Sinagra, with comparison markers for Wanneroo (C).
Babies and pre-schoolers (0 to 4)
2021 count
307
% of total
9.9%
Change from 2016
+3.8pp
307
9.9%
+3.8pp
Primary schoolers (5 to 11)
2021 count
390
% of total
12.6%
Change from 2016
+4.1pp
390
12.6%
+4.1pp
Secondary schoolers (12 to 17)
2021 count
220
% of total
7.1%
Change from 2016
+0.5pp
220
7.1%
+0.5pp
Tertiary education and independence (18 to 24)
2021 count
272
% of total
8.8%
Change from 2016
+2.5pp
272
8.8%
+2.5pp
Young workforce (25 to 34)
2021 count
589
% of total
19.0%
Change from 2016
+7.1pp
589
19.0%
+7.1pp
Parents and homebuilders (35 to 49)
2021 count
691
% of total
22.3%
Change from 2016
+2.6pp
691
22.3%
+2.6pp
Older workers and pre-retirees (50 to 59)
2021 count
297
% of total
9.6%
Change from 2016
-3.6pp
297
9.6%
-3.6pp
Empty nesters and retirees (60 to 69)
2021 count
198
% of total
6.4%
Change from 2016
-6.0pp
198
6.4%
-6.0pp
Seniors (70 to 84)
2021 count
128
% of total
4.1%
Change from 2016
-7.4pp
128
4.1%
-7.4pp
Elderly aged (85 and over)
2021 count
5
% of total
0.2%
Change from 2016
-3.5pp
5
0.2%
-3.5pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-203
+3.8pp
Primary schoolers (5 to 11)
-322
+4.1pp
Secondary schoolers (12 to 17)
-338
+0.5pp
Tertiary education and independence (18 to 24)
-256
+2.5pp
Young workforce (25 to 34)
-409
+7.1pp
Parents and homebuilders (35 to 49)
-967
+2.6pp
Older workers and pre-retirees (50 to 59)
-813
-3.6pp
Empty nesters and retirees (60 to 69)
-845
-6.0pp
Seniors (70 to 84)
-843
-7.4pp
Elderly aged (85 and over)
-303
-3.5pp
Data table
Service age groups for Sinagra. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Wanneroo (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Wanneroo (C)% | Count | % | Wanneroo (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 307 | 9.9% | 7.1% | 510 | 6.1% | 8.0% | -203 | +3.8pp |
| Primary schoolers (5 to 11) | 390 | 12.6% | 10.6% | 712 | 8.5% | 10.8% | -322 | +4.1pp |
| Secondary schoolers (12 to 17) | 220 | 7.1% | 8.5% | 558 | 6.6% | 8.5% | -338 | +0.5pp |
| Tertiary education and independence (18 to 24) | 272 | 8.8% | 9.0% | 528 | 6.3% | 9.6% | -256 | +2.5pp |
| Young workforce (25 to 34) | 589 | 19.0% | 13.9% | 998 | 11.9% | 15.7% | -409 | +7.1pp |
| Parents and homebuilders (35 to 49) | 691 | 22.3% | 21.7% | 1,658 | 19.7% | 22.4% | -967 | +2.6pp |
| Older workers and pre-retirees (50 to 59) | 297 | 9.6% | 12.5% | 1,110 | 13.2% | 11.2% | -813 | -3.6pp |
| Empty nesters and retirees (60 to 69) | 198 | 6.4% | 8.5% | 1,043 | 12.4% | 7.4% | -845 | -6.0pp |
| Seniors (70 to 84) | 128 | 4.1% | 7.0% | 971 | 11.5% | 5.4% | -843 | -7.4pp |
| Elderly aged (85 and over) | 5 | 0.2% | 1.3% | 308 | 3.7% | 1.0% | -303 | -3.5pp |
| Total | 3,100 | 100.0% | 100.0% | 8,419 | 100.0% | 100.0% | -5,319 | 0.0pp |