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 Northam (S), accounting for 7.6% (859 people). This share was higher than Regional WA (6.7%). Since 2016, the biggest change was in 70 to 74 year olds, which increased by 154 people and 1.3 percentage points.
Section overview
Age structure - Five year age groups
Northam (S) - Total persons (Usual residence)
This table summarises five year age groups for Northam (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 Northam (S), with comparison markers for Regional WA.
0 to 4
2021 count
584
% of total
5.1%
Change from 2016
-0.9pp
584
5.1%
-0.9pp
5 to 9
2021 count
757
% of total
6.7%
Change from 2016
+0.4pp
757
6.7%
+0.4pp
10 to 14
2021 count
718
% of total
6.3%
Change from 2016
-0.3pp
718
6.3%
-0.3pp
15 to 19
2021 count
671
% of total
5.9%
Change from 2016
+0.4pp
671
5.9%
+0.4pp
20 to 24
2021 count
568
% of total
5.0%
Change from 2016
-0.3pp
568
5.0%
-0.3pp
25 to 29
2021 count
554
% of total
4.9%
Change from 2016
-1.1pp
554
4.9%
-1.1pp
30 to 34
2021 count
686
% of total
6.0%
Change from 2016
0.0pp
686
6.0%
0.0pp
35 to 39
2021 count
682
% of total
6.0%
Change from 2016
+0.3pp
682
6.0%
+0.3pp
40 to 44
2021 count
617
% of total
5.4%
Change from 2016
-1.3pp
617
5.4%
-1.3pp
45 to 49
2021 count
735
% of total
6.5%
Change from 2016
0.0pp
735
6.5%
0.0pp
50 to 54
2021 count
747
% of total
6.6%
Change from 2016
0.0pp
747
6.6%
0.0pp
55 to 59
2021 count
803
% of total
7.1%
Change from 2016
-0.9pp
803
7.1%
-0.9pp
60 to 64
2021 count
859
% of total
7.6%
Change from 2016
+0.4pp
859
7.6%
+0.4pp
65 to 69
2021 count
773
% of total
6.8%
Change from 2016
+0.4pp
773
6.8%
+0.4pp
70 to 74
2021 count
666
% of total
5.9%
Change from 2016
+1.3pp
666
5.9%
+1.3pp
75 to 79
2021 count
442
% of total
3.9%
Change from 2016
+1.0pp
442
3.9%
+1.0pp
80 to 84
2021 count
262
% of total
2.3%
Change from 2016
+0.3pp
262
2.3%
+0.3pp
85 and over
2021 count
232
% of total
2.0%
Change from 2016
+0.2pp
232
2.0%
+0.2pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-84
-0.9pp
5 to 9
+61
+0.4pp
10 to 14
-17
-0.3pp
15 to 19
+57
+0.4pp
20 to 24
-22
-0.3pp
25 to 29
-108
-1.1pp
30 to 34
+22
0.0pp
35 to 39
+50
+0.3pp
40 to 44
-129
-1.3pp
45 to 49
+10
0.0pp
50 to 54
+10
0.0pp
55 to 59
-81
-0.9pp
60 to 64
+64
+0.4pp
65 to 69
+66
+0.4pp
70 to 74
+154
+1.3pp
75 to 79
+117
+1.0pp
80 to 84
+39
+0.3pp
85 and over
+36
+0.2pp
Data table
Five year age groups for Northam (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 | 584 | 5.1% | 6.0% | 668 | 6.0% | 6.6% | -84 | -0.9pp |
| 5 to 9 | 757 | 6.7% | 6.7% | 696 | 6.3% | 7.1% | +61 | +0.4pp |
| 10 to 14 | 718 | 6.3% | 6.7% | 735 | 6.6% | 6.5% | -17 | -0.3pp |
| 15 to 19 | 671 | 5.9% | 5.5% | 614 | 5.5% | 5.7% | +57 | +0.4pp |
| 20 to 24 | 568 | 5.0% | 4.8% | 590 | 5.3% | 5.0% | -22 | -0.3pp |
| 25 to 29 | 554 | 4.9% | 5.9% | 662 | 6.0% | 6.5% | -108 | -1.1pp |
| 30 to 34 | 686 | 6.0% | 6.6% | 664 | 6.0% | 7.1% | +22 | 0.0pp |
| 35 to 39 | 682 | 6.0% | 6.8% | 632 | 5.7% | 6.7% | +50 | +0.3pp |
| 40 to 44 | 617 | 5.4% | 6.4% | 746 | 6.7% | 7.0% | -129 | -1.3pp |
| 45 to 49 | 735 | 6.5% | 6.6% | 725 | 6.5% | 7.2% | +10 | 0.0pp |
| 50 to 54 | 747 | 6.6% | 6.9% | 737 | 6.6% | 7.1% | +10 | 0.0pp |
| 55 to 59 | 803 | 7.1% | 6.8% | 884 | 8.0% | 6.9% | -81 | -0.9pp |
| 60 to 64 | 859 | 7.6% | 6.7% | 795 | 7.2% | 6.0% | +64 | +0.4pp |
| 65 to 69 | 773 | 6.8% | 5.7% | 707 | 6.4% | 5.3% | +66 | +0.4pp |
| 70 to 74 | 666 | 5.9% | 4.9% | 512 | 4.6% | 3.6% | +154 | +1.3pp |
| 75 to 79 | 442 | 3.9% | 3.2% | 325 | 2.9% | 2.6% | +117 | +1.0pp |
| 80 to 84 | 262 | 2.3% | 2.0% | 223 | 2.0% | 1.6% | +39 | +0.3pp |
| 85 and over | 232 | 2.0% | 1.7% | 196 | 1.8% | 1.5% | +36 | +0.2pp |
| Total | 11,358 | 100.0% | 100.0% | 11,112 | 100.0% | 100.0% | +246 | 0.0pp |