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 Rockingham (WA), accounting for 7.7% (1,176 people). This share was higher than Rockingham (C) (6.2%). Since 2016, the biggest change was in 65 to 69 year olds, which increased by 215 people and 1.1 percentage points.
Section overview
Age structure - Five year age groups
Rockingham (WA) - Total persons (Usual residence)
This table summarises five year age groups for Rockingham (WA) in 2021 for persons, with comparison against Rockingham (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Rockingham (WA), with comparison markers for Rockingham (C).
0 to 4
2021 count
629
% of total
4.1%
Change from 2016
-0.6pp
629
4.1%
-0.6pp
5 to 9
2021 count
621
% of total
4.1%
Change from 2016
-0.6pp
621
4.1%
-0.6pp
10 to 14
2021 count
704
% of total
4.6%
Change from 2016
+0.2pp
704
4.6%
+0.2pp
15 to 19
2021 count
676
% of total
4.4%
Change from 2016
-0.7pp
676
4.4%
-0.7pp
20 to 24
2021 count
907
% of total
5.9%
Change from 2016
0.0pp
907
5.9%
0.0pp
25 to 29
2021 count
875
% of total
5.7%
Change from 2016
-0.1pp
875
5.7%
-0.1pp
30 to 34
2021 count
824
% of total
5.4%
Change from 2016
-0.2pp
824
5.4%
-0.2pp
35 to 39
2021 count
822
% of total
5.4%
Change from 2016
0.0pp
822
5.4%
0.0pp
40 to 44
2021 count
817
% of total
5.3%
Change from 2016
-0.4pp
817
5.3%
-0.4pp
45 to 49
2021 count
895
% of total
5.8%
Change from 2016
-0.8pp
895
5.8%
-0.8pp
50 to 54
2021 count
1,050
% of total
6.9%
Change from 2016
-0.5pp
1,050
6.9%
-0.5pp
55 to 59
2021 count
1,176
% of total
7.7%
Change from 2016
+0.3pp
1,176
7.7%
+0.3pp
60 to 64
2021 count
1,150
% of total
7.5%
Change from 2016
+0.5pp
1,150
7.5%
+0.5pp
65 to 69
2021 count
1,114
% of total
7.3%
Change from 2016
+1.1pp
1,114
7.3%
+1.1pp
70 to 74
2021 count
988
% of total
6.5%
Change from 2016
+0.5pp
988
6.5%
+0.5pp
75 to 79
2021 count
796
% of total
5.2%
Change from 2016
+0.3pp
796
5.2%
+0.3pp
80 to 84
2021 count
630
% of total
4.1%
Change from 2016
+0.1pp
630
4.1%
+0.1pp
85 and over
2021 count
618
% of total
4.0%
Change from 2016
+0.6pp
618
4.0%
+0.6pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-54
-0.6pp
5 to 9
-60
-0.6pp
10 to 14
+74
+0.2pp
15 to 19
-61
-0.7pp
20 to 24
+51
0.0pp
25 to 29
+45
-0.1pp
30 to 34
+21
-0.2pp
35 to 39
+38
0.0pp
40 to 44
-12
-0.4pp
45 to 49
-55
-0.8pp
50 to 54
-17
-0.5pp
55 to 59
+109
+0.3pp
60 to 64
+147
+0.5pp
65 to 69
+215
+1.1pp
70 to 74
+121
+0.5pp
75 to 79
+94
+0.3pp
80 to 84
+59
+0.1pp
85 and over
+129
+0.6pp
Data table
Five year age groups for Rockingham (WA). Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Rockingham (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Rockingham (C)% | Count | % | Rockingham (C)% | Count | pp | |
| 0 to 4 | 629 | 4.1% | 6.7% | 683 | 4.7% | 7.5% | -54 | -0.6pp |
| 5 to 9 | 621 | 4.1% | 7.3% | 681 | 4.7% | 7.9% | -60 | -0.6pp |
| 10 to 14 | 704 | 4.6% | 7.6% | 630 | 4.4% | 6.9% | +74 | +0.2pp |
| 15 to 19 | 676 | 4.4% | 6.5% | 737 | 5.1% | 6.6% | -61 | -0.7pp |
| 20 to 24 | 907 | 5.9% | 6.0% | 856 | 5.9% | 6.8% | +51 | 0.0pp |
| 25 to 29 | 875 | 5.7% | 6.4% | 830 | 5.8% | 7.2% | +45 | -0.1pp |
| 30 to 34 | 824 | 5.4% | 7.1% | 803 | 5.6% | 7.4% | +21 | -0.2pp |
| 35 to 39 | 822 | 5.4% | 7.1% | 784 | 5.4% | 6.7% | +38 | 0.0pp |
| 40 to 44 | 817 | 5.3% | 6.4% | 829 | 5.7% | 7.1% | -12 | -0.4pp |
| 45 to 49 | 895 | 5.8% | 6.6% | 950 | 6.6% | 7.1% | -55 | -0.8pp |
| 50 to 54 | 1,050 | 6.9% | 6.6% | 1,067 | 7.4% | 6.7% | -17 | -0.5pp |
| 55 to 59 | 1,176 | 7.7% | 6.2% | 1,067 | 7.4% | 5.5% | +109 | +0.3pp |
| 60 to 64 | 1,150 | 7.5% | 5.2% | 1,003 | 7.0% | 4.5% | +147 | +0.5pp |
| 65 to 69 | 1,114 | 7.3% | 4.3% | 899 | 6.2% | 4.0% | +215 | +1.1pp |
| 70 to 74 | 988 | 6.5% | 3.7% | 867 | 6.0% | 3.1% | +121 | +0.5pp |
| 75 to 79 | 796 | 5.2% | 2.8% | 702 | 4.9% | 2.3% | +94 | +0.3pp |
| 80 to 84 | 630 | 4.1% | 1.8% | 571 | 4.0% | 1.6% | +59 | +0.1pp |
| 85 and over | 618 | 4.0% | 1.5% | 489 | 3.4% | 1.4% | +129 | +0.6pp |
| Total | 15,312 | 100.0% | 100.0% | 14,428 | 100.0% | 100.0% | +884 | 0.0pp |