Population
Five year age groups
About this topic
Five year age groups show the population in standard five-year cohorts from early childhood through older age. Because each band covers the same span of years, the topic gives a clear and comparable view of an area's age structure.
This topic is useful for identifying growth or decline in specific cohorts and for comparing age patterns across places and over time. For service planning, it is often read together with service age groups, household types, and dwelling types.
Interpretation notes
- Age is reported as at Census night, so the counts are a snapshot of the resident age structure at that point in time.
- Because each band covers the same five-year span, this topic is best for exact cohort comparison rather than service-planning life stages.
Related topics
Key insight
In 2021, 35 to 39 year olds was the largest age group among residents in Kwinana (C), accounting for 9.4% (4,303 people). This share was higher than Greater Perth (7.7%). Since 2016, the biggest change was in 35 to 39 year olds, which increased by 1,134 people and 1.3 percentage points.
Section overview
Age structure - Five year age groups
Kwinana (C) - Total persons (Usual residence)
This table summarises five year age groups for Kwinana (C) in 2021 for persons, with comparison against Greater Perth and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Kwinana (C), with comparison markers for Greater Perth.
0 to 4
2021 count
3,814
% of total
8.3%
Change from 2016
-0.4pp
3,814
8.3%
-0.4pp
5 to 9
2021 count
3,541
% of total
7.7%
Change from 2016
+0.1pp
3,541
7.7%
+0.1pp
10 to 14
2021 count
3,055
% of total
6.7%
Change from 2016
+0.7pp
3,055
6.7%
+0.7pp
15 to 19
2021 count
2,616
% of total
5.7%
Change from 2016
-0.2pp
2,616
5.7%
-0.2pp
20 to 24
2021 count
3,025
% of total
6.6%
Change from 2016
-0.8pp
3,025
6.6%
-0.8pp
25 to 29
2021 count
3,697
% of total
8.1%
Change from 2016
-1.0pp
3,697
8.1%
-1.0pp
30 to 34
2021 count
4,146
% of total
9.0%
Change from 2016
-1.4pp
4,146
9.0%
-1.4pp
35 to 39
2021 count
4,303
% of total
9.4%
Change from 2016
+1.3pp
4,303
9.4%
+1.3pp
40 to 44
2021 count
3,399
% of total
7.4%
Change from 2016
+0.2pp
3,399
7.4%
+0.2pp
45 to 49
2021 count
2,980
% of total
6.5%
Change from 2016
-0.1pp
2,980
6.5%
-0.1pp
50 to 54
2021 count
2,703
% of total
5.9%
Change from 2016
+0.5pp
2,703
5.9%
+0.5pp
55 to 59
2021 count
2,277
% of total
5.0%
Change from 2016
+0.4pp
2,277
5.0%
+0.4pp
60 to 64
2021 count
1,849
% of total
4.0%
Change from 2016
+0.1pp
1,849
4.0%
+0.1pp
65 to 69
2021 count
1,554
% of total
3.4%
Change from 2016
+0.2pp
1,554
3.4%
+0.2pp
70 to 74
2021 count
1,160
% of total
2.5%
Change from 2016
+0.2pp
1,160
2.5%
+0.2pp
75 to 79
2021 count
785
% of total
1.7%
Change from 2016
0.0pp
785
1.7%
0.0pp
80 to 84
2021 count
523
% of total
1.1%
Change from 2016
0.0pp
523
1.1%
0.0pp
85 and over
2021 count
420
% of total
0.9%
Change from 2016
+0.1pp
420
0.9%
+0.1pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+425
-0.4pp
5 to 9
+583
+0.1pp
10 to 14
+715
+0.7pp
15 to 19
+319
-0.2pp
20 to 24
+152
-0.8pp
25 to 29
+148
-1.0pp
30 to 34
+111
-1.4pp
35 to 39
+1,134
+1.3pp
40 to 44
+613
+0.2pp
45 to 49
+423
-0.1pp
50 to 54
+619
+0.5pp
55 to 59
+476
+0.4pp
60 to 64
+336
+0.1pp
65 to 69
+303
+0.2pp
70 to 74
+255
+0.2pp
75 to 79
+132
0.0pp
80 to 84
+84
0.0pp
85 and over
+105
+0.1pp
Data table
Five year age groups for Kwinana (C). Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Greater Perth.
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Greater Perth% | Count | % | Greater Perth% | Count | pp | |
| 0 to 4 | 3,814 | 8.3% | 6.1% | 3,389 | 8.7% | 6.5% | +425 | -0.4pp |
| 5 to 9 | 3,541 | 7.7% | 6.4% | 2,958 | 7.6% | 6.5% | +583 | +0.1pp |
| 10 to 14 | 3,055 | 6.7% | 6.4% | 2,340 | 6.0% | 6.0% | +715 | +0.7pp |
| 15 to 19 | 2,616 | 5.7% | 5.8% | 2,297 | 5.9% | 6.2% | +319 | -0.2pp |
| 20 to 24 | 3,025 | 6.6% | 6.3% | 2,873 | 7.4% | 6.9% | +152 | -0.8pp |
| 25 to 29 | 3,697 | 8.1% | 6.8% | 3,549 | 9.1% | 7.7% | +148 | -1.0pp |
| 30 to 34 | 4,146 | 9.0% | 7.6% | 4,035 | 10.4% | 8.0% | +111 | -1.4pp |
| 35 to 39 | 4,303 | 9.4% | 7.7% | 3,169 | 8.1% | 7.1% | +1,134 | +1.3pp |
| 40 to 44 | 3,399 | 7.4% | 6.8% | 2,786 | 7.2% | 6.9% | +613 | +0.2pp |
| 45 to 49 | 2,980 | 6.5% | 6.5% | 2,557 | 6.6% | 6.9% | +423 | -0.1pp |
| 50 to 54 | 2,703 | 5.9% | 6.4% | 2,084 | 5.4% | 6.4% | +619 | +0.5pp |
| 55 to 59 | 2,277 | 5.0% | 5.9% | 1,801 | 4.6% | 5.8% | +476 | +0.4pp |
| 60 to 64 | 1,849 | 4.0% | 5.4% | 1,513 | 3.9% | 5.1% | +336 | +0.1pp |
| 65 to 69 | 1,554 | 3.4% | 4.8% | 1,251 | 3.2% | 4.6% | +303 | +0.2pp |
| 70 to 74 | 1,160 | 2.5% | 4.2% | 905 | 2.3% | 3.3% | +255 | +0.2pp |
| 75 to 79 | 785 | 1.7% | 2.9% | 653 | 1.7% | 2.5% | +132 | 0.0pp |
| 80 to 84 | 523 | 1.1% | 2.0% | 439 | 1.1% | 1.7% | +84 | 0.0pp |
| 85 and over | 420 | 0.9% | 1.9% | 315 | 0.8% | 1.8% | +105 | +0.1pp |
| Total | 45,867 | 100.0% | 100.0% | 38,918 | 100.0% | 100.0% | +6,949 | 0.0pp |