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, 30 to 34 year olds was the largest age group among residents in Derby-West Kimberley (S), accounting for 9.4% (665 people). This share was higher than Regional WA (6.6%). Since 2016, the biggest change was in 0 to 4 year olds, which decreased by 182 people and 1.7 percentage points.
Section overview
Age structure - Five year age groups
Derby-West Kimberley (S) - Total persons (Usual residence)
This table summarises five year age groups for Derby-West Kimberley (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 Derby-West Kimberley (S), with comparison markers for Regional WA.
0 to 4
2021 count
543
% of total
7.7%
Change from 2016
-1.7pp
543
7.7%
-1.7pp
5 to 9
2021 count
581
% of total
8.2%
Change from 2016
-0.6pp
581
8.2%
-0.6pp
10 to 14
2021 count
487
% of total
6.9%
Change from 2016
-0.6pp
487
6.9%
-0.6pp
15 to 19
2021 count
483
% of total
6.8%
Change from 2016
+0.2pp
483
6.8%
+0.2pp
20 to 24
2021 count
551
% of total
7.8%
Change from 2016
+0.2pp
551
7.8%
+0.2pp
25 to 29
2021 count
611
% of total
8.6%
Change from 2016
-0.4pp
611
8.6%
-0.4pp
30 to 34
2021 count
665
% of total
9.4%
Change from 2016
+0.8pp
665
9.4%
+0.8pp
35 to 39
2021 count
516
% of total
7.3%
Change from 2016
+0.1pp
516
7.3%
+0.1pp
40 to 44
2021 count
433
% of total
6.1%
Change from 2016
-0.2pp
433
6.1%
-0.2pp
45 to 49
2021 count
434
% of total
6.1%
Change from 2016
-0.1pp
434
6.1%
-0.1pp
50 to 54
2021 count
410
% of total
5.8%
Change from 2016
-0.4pp
410
5.8%
-0.4pp
55 to 59
2021 count
418
% of total
5.9%
Change from 2016
+0.4pp
418
5.9%
+0.4pp
60 to 64
2021 count
357
% of total
5.0%
Change from 2016
+0.4pp
357
5.0%
+0.4pp
65 to 69
2021 count
267
% of total
3.8%
Change from 2016
+0.8pp
267
3.8%
+0.8pp
70 to 74
2021 count
160
% of total
2.3%
Change from 2016
+1.0pp
160
2.3%
+1.0pp
75 to 79
2021 count
72
% of total
1.0%
Change from 2016
+0.1pp
72
1.0%
+0.1pp
80 to 84
2021 count
45
% of total
0.6%
Change from 2016
+0.1pp
45
0.6%
+0.1pp
85 and over
2021 count
35
% of total
0.5%
Change from 2016
0.0pp
35
0.5%
0.0pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-182
-1.7pp
5 to 9
-103
-0.6pp
10 to 14
-90
-0.6pp
15 to 19
-24
+0.2pp
20 to 24
-40
+0.2pp
25 to 29
-88
-0.4pp
30 to 34
+3
+0.8pp
35 to 39
-38
+0.1pp
40 to 44
-55
-0.2pp
45 to 49
-45
-0.1pp
50 to 54
-66
-0.4pp
55 to 59
-10
+0.4pp
60 to 64
+4
+0.4pp
65 to 69
+36
+0.8pp
70 to 74
+57
+1.0pp
75 to 79
+6
+0.1pp
80 to 84
+10
+0.1pp
85 and over
-3
0.0pp
Data table
Five year age groups for Derby-West Kimberley (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 | 543 | 7.7% | 6.0% | 725 | 9.4% | 6.6% | -182 | -1.7pp |
| 5 to 9 | 581 | 8.2% | 6.7% | 684 | 8.8% | 7.1% | -103 | -0.6pp |
| 10 to 14 | 487 | 6.9% | 6.7% | 577 | 7.5% | 6.5% | -90 | -0.6pp |
| 15 to 19 | 483 | 6.8% | 5.5% | 507 | 6.6% | 5.7% | -24 | +0.2pp |
| 20 to 24 | 551 | 7.8% | 4.8% | 591 | 7.6% | 5.0% | -40 | +0.2pp |
| 25 to 29 | 611 | 8.6% | 5.9% | 699 | 9.0% | 6.5% | -88 | -0.4pp |
| 30 to 34 | 665 | 9.4% | 6.6% | 662 | 8.6% | 7.1% | +3 | +0.8pp |
| 35 to 39 | 516 | 7.3% | 6.8% | 554 | 7.2% | 6.7% | -38 | +0.1pp |
| 40 to 44 | 433 | 6.1% | 6.4% | 488 | 6.3% | 7.0% | -55 | -0.2pp |
| 45 to 49 | 434 | 6.1% | 6.6% | 479 | 6.2% | 7.2% | -45 | -0.1pp |
| 50 to 54 | 410 | 5.8% | 6.9% | 476 | 6.2% | 7.1% | -66 | -0.4pp |
| 55 to 59 | 418 | 5.9% | 6.8% | 428 | 5.5% | 6.9% | -10 | +0.4pp |
| 60 to 64 | 357 | 5.0% | 6.7% | 353 | 4.6% | 6.0% | +4 | +0.4pp |
| 65 to 69 | 267 | 3.8% | 5.7% | 231 | 3.0% | 5.3% | +36 | +0.8pp |
| 70 to 74 | 160 | 2.3% | 4.9% | 103 | 1.3% | 3.6% | +57 | +1.0pp |
| 75 to 79 | 72 | 1.0% | 3.2% | 66 | 0.9% | 2.6% | +6 | +0.1pp |
| 80 to 84 | 45 | 0.6% | 2.0% | 35 | 0.5% | 1.6% | +10 | +0.1pp |
| 85 and over | 35 | 0.5% | 1.7% | 38 | 0.5% | 1.5% | -3 | 0.0pp |
| Total | 7,075 | 100.0% | 100.0% | 7,730 | 100.0% | 100.0% | -655 | 0.0pp |