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 East Pilbara (S), accounting for 12.6% (1,232 people). This share was higher than Regional WA (6.6%). Since 2016, the biggest change was in 25 to 29 year olds, which decreased by 309 people and 2.1 percentage points.
Section overview
Age structure - Five year age groups
East Pilbara (S) - Total persons (Usual residence)
This table summarises five year age groups for East Pilbara (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 East Pilbara (S), with comparison markers for Regional WA.
0 to 4
2021 count
561
% of total
5.7%
Change from 2016
+0.1pp
561
5.7%
+0.1pp
5 to 9
2021 count
564
% of total
5.8%
Change from 2016
+0.4pp
564
5.8%
+0.4pp
10 to 14
2021 count
472
% of total
4.8%
Change from 2016
+0.7pp
472
4.8%
+0.7pp
15 to 19
2021 count
384
% of total
3.9%
Change from 2016
+0.8pp
384
3.9%
+0.8pp
20 to 24
2021 count
651
% of total
6.7%
Change from 2016
+0.4pp
651
6.7%
+0.4pp
25 to 29
2021 count
1,095
% of total
11.2%
Change from 2016
-2.1pp
1,095
11.2%
-2.1pp
30 to 34
2021 count
1,232
% of total
12.6%
Change from 2016
-1.8pp
1,232
12.6%
-1.8pp
35 to 39
2021 count
1,131
% of total
11.6%
Change from 2016
+0.5pp
1,131
11.6%
+0.5pp
40 to 44
2021 count
887
% of total
9.1%
Change from 2016
-0.5pp
887
9.1%
-0.5pp
45 to 49
2021 count
771
% of total
7.9%
Change from 2016
-0.4pp
771
7.9%
-0.4pp
50 to 54
2021 count
715
% of total
7.3%
Change from 2016
-0.3pp
715
7.3%
-0.3pp
55 to 59
2021 count
593
% of total
6.1%
Change from 2016
+0.4pp
593
6.1%
+0.4pp
60 to 64
2021 count
431
% of total
4.4%
Change from 2016
+1.1pp
431
4.4%
+1.1pp
65 to 69
2021 count
170
% of total
1.7%
Change from 2016
+0.5pp
170
1.7%
+0.5pp
70 to 74
2021 count
73
% of total
0.7%
Change from 2016
+0.1pp
73
0.7%
+0.1pp
75 to 79
2021 count
29
% of total
0.3%
Change from 2016
+0.2pp
29
0.3%
+0.2pp
80 to 84
2021 count
13
% of total
0.1%
Change from 2016
0.0pp
13
0.1%
0.0pp
85 and over
2021 count
5
% of total
0.1%
Change from 2016
+0.1pp
5
0.1%
+0.1pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-37
+0.1pp
5 to 9
-3
+0.4pp
10 to 14
+34
+0.7pp
15 to 19
+60
+0.8pp
20 to 24
-18
+0.4pp
25 to 29
-309
-2.1pp
30 to 34
-297
-1.8pp
35 to 39
-44
+0.5pp
40 to 44
-132
-0.5pp
45 to 49
-109
-0.4pp
50 to 54
-92
-0.3pp
55 to 59
-9
+0.4pp
60 to 64
+81
+1.1pp
65 to 69
+38
+0.5pp
70 to 74
+6
+0.1pp
75 to 79
+16
+0.2pp
80 to 84
+4
0.0pp
85 and over
+2
+0.1pp
Data table
Five year age groups for East Pilbara (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 | 561 | 5.7% | 6.0% | 598 | 5.6% | 6.6% | -37 | +0.1pp |
| 5 to 9 | 564 | 5.8% | 6.7% | 567 | 5.4% | 7.1% | -3 | +0.4pp |
| 10 to 14 | 472 | 4.8% | 6.7% | 438 | 4.1% | 6.5% | +34 | +0.7pp |
| 15 to 19 | 384 | 3.9% | 5.5% | 324 | 3.1% | 5.7% | +60 | +0.8pp |
| 20 to 24 | 651 | 6.7% | 4.8% | 669 | 6.3% | 5.0% | -18 | +0.4pp |
| 25 to 29 | 1,095 | 11.2% | 5.9% | 1,404 | 13.3% | 6.5% | -309 | -2.1pp |
| 30 to 34 | 1,232 | 12.6% | 6.6% | 1,529 | 14.4% | 7.1% | -297 | -1.8pp |
| 35 to 39 | 1,131 | 11.6% | 6.8% | 1,175 | 11.1% | 6.7% | -44 | +0.5pp |
| 40 to 44 | 887 | 9.1% | 6.4% | 1,019 | 9.6% | 7.0% | -132 | -0.5pp |
| 45 to 49 | 771 | 7.9% | 6.6% | 880 | 8.3% | 7.2% | -109 | -0.4pp |
| 50 to 54 | 715 | 7.3% | 6.9% | 807 | 7.6% | 7.1% | -92 | -0.3pp |
| 55 to 59 | 593 | 6.1% | 6.8% | 602 | 5.7% | 6.9% | -9 | +0.4pp |
| 60 to 64 | 431 | 4.4% | 6.7% | 350 | 3.3% | 6.0% | +81 | +1.1pp |
| 65 to 69 | 170 | 1.7% | 5.7% | 132 | 1.2% | 5.3% | +38 | +0.5pp |
| 70 to 74 | 73 | 0.7% | 4.9% | 67 | 0.6% | 3.6% | +6 | +0.1pp |
| 75 to 79 | 29 | 0.3% | 3.2% | 13 | 0.1% | 2.6% | +16 | +0.2pp |
| 80 to 84 | 13 | 0.1% | 2.0% | 9 | 0.1% | 1.6% | +4 | 0.0pp |
| 85 and over | 5 | 0.1% | 1.7% | 3 | 0.0% | 1.5% | +2 | +0.1pp |
| Total | 9,760 | 100.0% | 100.0% | 10,591 | 100.0% | 100.0% | -831 | 0.0pp |