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, 55 to 59 year olds was the largest age group among residents in Kojonup, accounting for 9.6% (111 people). This share was higher than Kojonup (S) (8.6%). Since 2016, the biggest change was in 45 to 49 year olds, which decreased by 46 people and 3.1 percentage points.
Section overview
Age structure - Five year age groups
Kojonup - Total persons (Usual residence)
This table summarises five year age groups for Kojonup in 2021 for persons, with comparison against Kojonup (S) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Kojonup, with comparison markers for Kojonup (S).
0 to 4
2021 count
61
% of total
5.3%
Change from 2016
-2.7pp
61
5.3%
-2.7pp
5 to 9
2021 count
86
% of total
7.4%
Change from 2016
+0.2pp
86
7.4%
+0.2pp
10 to 14
2021 count
69
% of total
6.0%
Change from 2016
+1.5pp
69
6.0%
+1.5pp
15 to 19
2021 count
37
% of total
3.2%
Change from 2016
-0.4pp
37
3.2%
-0.4pp
20 to 24
2021 count
36
% of total
3.1%
Change from 2016
-1.0pp
36
3.1%
-1.0pp
25 to 29
2021 count
63
% of total
5.4%
Change from 2016
+1.5pp
63
5.4%
+1.5pp
30 to 34
2021 count
52
% of total
4.5%
Change from 2016
-2.4pp
52
4.5%
-2.4pp
35 to 39
2021 count
92
% of total
8.0%
Change from 2016
+2.8pp
92
8.0%
+2.8pp
40 to 44
2021 count
55
% of total
4.8%
Change from 2016
+0.9pp
55
4.8%
+0.9pp
45 to 49
2021 count
47
% of total
4.1%
Change from 2016
-3.1pp
47
4.1%
-3.1pp
50 to 54
2021 count
86
% of total
7.4%
Change from 2016
-2.2pp
86
7.4%
-2.2pp
55 to 59
2021 count
111
% of total
9.6%
Change from 2016
+2.7pp
111
9.6%
+2.7pp
60 to 64
2021 count
82
% of total
7.1%
Change from 2016
+0.4pp
82
7.1%
+0.4pp
65 to 69
2021 count
72
% of total
6.2%
Change from 2016
-0.4pp
72
6.2%
-0.4pp
70 to 74
2021 count
59
% of total
5.1%
Change from 2016
+1.6pp
59
5.1%
+1.6pp
75 to 79
2021 count
49
% of total
4.2%
Change from 2016
+0.1pp
49
4.2%
+0.1pp
80 to 84
2021 count
53
% of total
4.6%
Change from 2016
+1.0pp
53
4.6%
+1.0pp
85 and over
2021 count
48
% of total
4.1%
Change from 2016
0.0pp
48
4.1%
0.0pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-43
-2.7pp
5 to 9
-7
+0.2pp
10 to 14
+10
+1.5pp
15 to 19
-10
-0.4pp
20 to 24
-17
-1.0pp
25 to 29
+12
+1.5pp
30 to 34
-38
-2.4pp
35 to 39
+25
+2.8pp
40 to 44
+5
+0.9pp
45 to 49
-46
-3.1pp
50 to 54
-39
-2.2pp
55 to 59
+22
+2.7pp
60 to 64
-5
+0.4pp
65 to 69
-14
-0.4pp
70 to 74
+14
+1.6pp
75 to 79
-4
+0.1pp
80 to 84
+6
+1.0pp
85 and over
-5
0.0pp
Data table
Five year age groups for Kojonup. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Kojonup (S).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Kojonup (S)% | Count | % | Kojonup (S)% | Count | pp | |
| 0 to 4 | 61 | 5.3% | 5.7% | 104 | 8.0% | 7.5% | -43 | -2.7pp |
| 5 to 9 | 86 | 7.4% | 7.7% | 93 | 7.2% | 8.3% | -7 | +0.2pp |
| 10 to 14 | 69 | 6.0% | 6.0% | 59 | 4.5% | 5.0% | +10 | +1.5pp |
| 15 to 19 | 37 | 3.2% | 3.6% | 47 | 3.6% | 2.8% | -10 | -0.4pp |
| 20 to 24 | 36 | 3.1% | 4.1% | 53 | 4.1% | 3.6% | -17 | -1.0pp |
| 25 to 29 | 63 | 5.4% | 4.8% | 51 | 3.9% | 4.2% | +12 | +1.5pp |
| 30 to 34 | 52 | 4.5% | 4.1% | 90 | 6.9% | 7.1% | -38 | -2.4pp |
| 35 to 39 | 92 | 8.0% | 7.4% | 67 | 5.2% | 5.2% | +25 | +2.8pp |
| 40 to 44 | 55 | 4.8% | 5.7% | 50 | 3.9% | 5.4% | +5 | +0.9pp |
| 45 to 49 | 47 | 4.1% | 4.9% | 93 | 7.2% | 7.4% | -46 | -3.1pp |
| 50 to 54 | 86 | 7.4% | 7.1% | 125 | 9.6% | 8.1% | -39 | -2.2pp |
| 55 to 59 | 111 | 9.6% | 8.6% | 89 | 6.9% | 7.2% | +22 | +2.7pp |
| 60 to 64 | 82 | 7.1% | 7.5% | 87 | 6.7% | 7.1% | -5 | +0.4pp |
| 65 to 69 | 72 | 6.2% | 6.6% | 86 | 6.6% | 5.6% | -14 | -0.4pp |
| 70 to 74 | 59 | 5.1% | 5.2% | 45 | 3.5% | 4.8% | +14 | +1.6pp |
| 75 to 79 | 49 | 4.2% | 4.4% | 53 | 4.1% | 3.3% | -4 | +0.1pp |
| 80 to 84 | 53 | 4.6% | 3.4% | 47 | 3.6% | 2.7% | +6 | +1.0pp |
| 85 and over | 48 | 4.1% | 3.2% | 53 | 4.1% | 2.9% | -5 | 0.0pp |
| Total | 1,157 | 100.0% | 100.0% | 1,298 | 100.0% | 100.0% | -141 | 0.0pp |