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, 60 to 64 year olds was the largest age group among residents in Koorda (S), accounting for 10.2% (37 people). This share was higher than Regional WA (6.7%). Since 2016, the biggest change was in 55 to 59 year olds, which decreased by 13 people and 2.1 percentage points.
Section overview
Age structure - Five year age groups
Koorda (S) - Total persons (Usual residence)
This table summarises five year age groups for Koorda (S) in 2021 for persons, with comparison against Regional WA and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Koorda (S), with comparison markers for Regional WA.
0 to 4
2021 count
21
% of total
5.8%
Change from 2016
-1.7pp
21
5.8%
-1.7pp
5 to 9
2021 count
36
% of total
10.0%
Change from 2016
+1.3pp
36
10.0%
+1.3pp
10 to 14
2021 count
19
% of total
5.3%
Change from 2016
+2.6pp
19
5.3%
+2.6pp
15 to 19
2021 count
6
% of total
1.7%
Change from 2016
-0.7pp
6
1.7%
-0.7pp
20 to 24
2021 count
11
% of total
3.0%
Change from 2016
+0.8pp
11
3.0%
+0.8pp
25 to 29
2021 count
14
% of total
3.9%
Change from 2016
-0.4pp
14
3.9%
-0.4pp
30 to 34
2021 count
29
% of total
8.0%
Change from 2016
+3.4pp
29
8.0%
+3.4pp
35 to 39
2021 count
22
% of total
6.1%
Change from 2016
+0.8pp
22
6.1%
+0.8pp
40 to 44
2021 count
23
% of total
6.4%
Change from 2016
+0.8pp
23
6.4%
+0.8pp
45 to 49
2021 count
31
% of total
8.6%
Change from 2016
+0.1pp
31
8.6%
+0.1pp
50 to 54
2021 count
29
% of total
8.0%
Change from 2016
+0.5pp
29
8.0%
+0.5pp
55 to 59
2021 count
28
% of total
7.8%
Change from 2016
-2.1pp
28
7.8%
-2.1pp
60 to 64
2021 count
37
% of total
10.2%
Change from 2016
+1.0pp
37
10.2%
+1.0pp
65 to 69
2021 count
34
% of total
9.4%
Change from 2016
+3.6pp
34
9.4%
+3.6pp
70 to 74
2021 count
25
% of total
6.9%
Change from 2016
+3.0pp
25
6.9%
+3.0pp
75 to 79
2021 count
13
% of total
3.6%
Change from 2016
-0.7pp
13
3.6%
-0.7pp
80 to 84
2021 count
11
% of total
3.0%
Change from 2016
+1.6pp
11
3.0%
+1.6pp
85 and over
2021 count
6
% of total
1.7%
Change from 2016
0.0pp
6
1.7%
0.0pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-10
-1.7pp
5 to 9
0
+1.3pp
10 to 14
+8
+2.6pp
15 to 19
-4
-0.7pp
20 to 24
+2
+0.8pp
25 to 29
-4
-0.4pp
30 to 34
+10
+3.4pp
35 to 39
0
+0.8pp
40 to 44
0
+0.8pp
45 to 49
-4
+0.1pp
50 to 54
-2
+0.5pp
55 to 59
-13
-2.1pp
60 to 64
-1
+1.0pp
65 to 69
+10
+3.6pp
70 to 74
+9
+3.0pp
75 to 79
-5
-0.7pp
80 to 84
+5
+1.6pp
85 and over
-1
0.0pp
Data table
Five year age groups for Koorda (S). Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Regional WA.
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Regional WA% | Count | % | Regional WA% | Count | pp | |
| 0 to 4 | 21 | 5.8% | 6.0% | 31 | 7.5% | 6.6% | -10 | -1.7pp |
| 5 to 9 | 36 | 10.0% | 6.7% | 36 | 8.7% | 7.1% | 0 | +1.3pp |
| 10 to 14 | 19 | 5.3% | 6.7% | 11 | 2.7% | 6.5% | +8 | +2.6pp |
| 15 to 19 | 6 | 1.7% | 5.5% | 10 | 2.4% | 5.7% | -4 | -0.7pp |
| 20 to 24 | 11 | 3.0% | 4.8% | 9 | 2.2% | 5.0% | +2 | +0.8pp |
| 25 to 29 | 14 | 3.9% | 5.9% | 18 | 4.3% | 6.5% | -4 | -0.4pp |
| 30 to 34 | 29 | 8.0% | 6.6% | 19 | 4.6% | 7.1% | +10 | +3.4pp |
| 35 to 39 | 22 | 6.1% | 6.8% | 22 | 5.3% | 6.7% | 0 | +0.8pp |
| 40 to 44 | 23 | 6.4% | 6.4% | 23 | 5.6% | 7.0% | 0 | +0.8pp |
| 45 to 49 | 31 | 8.6% | 6.6% | 35 | 8.5% | 7.2% | -4 | +0.1pp |
| 50 to 54 | 29 | 8.0% | 6.9% | 31 | 7.5% | 7.1% | -2 | +0.5pp |
| 55 to 59 | 28 | 7.8% | 6.8% | 41 | 9.9% | 6.9% | -13 | -2.1pp |
| 60 to 64 | 37 | 10.2% | 6.7% | 38 | 9.2% | 6.0% | -1 | +1.0pp |
| 65 to 69 | 34 | 9.4% | 5.7% | 24 | 5.8% | 5.3% | +10 | +3.6pp |
| 70 to 74 | 25 | 6.9% | 4.9% | 16 | 3.9% | 3.6% | +9 | +3.0pp |
| 75 to 79 | 13 | 3.6% | 3.2% | 18 | 4.3% | 2.6% | -5 | -0.7pp |
| 80 to 84 | 11 | 3.0% | 2.0% | 6 | 1.4% | 1.6% | +5 | +1.6pp |
| 85 and over | 6 | 1.7% | 1.7% | 7 | 1.7% | 1.5% | -1 | 0.0pp |
| Total | 361 | 100.0% | 100.0% | 414 | 100.0% | 100.0% | -53 | 0.0pp |