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 Main Arm, accounting for 9.7% (62 people). This share was higher than Byron (A) (6.9%). Since 2016, the biggest change was in 70 to 74 year olds, which increased by 32 people and 4.9 percentage points.
Section overview
Age structure - Five year age groups
Main Arm - Total persons (Usual residence)
This table summarises five year age groups for Main Arm in 2021 for persons, with comparison against Byron (A) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Main Arm, with comparison markers for Byron (A).
0 to 4
2021 count
35
% of total
5.5%
Change from 2016
-1.5pp
35
5.5%
-1.5pp
5 to 9
2021 count
30
% of total
4.7%
Change from 2016
-1.3pp
30
4.7%
-1.3pp
10 to 14
2021 count
48
% of total
7.5%
Change from 2016
+2.2pp
48
7.5%
+2.2pp
15 to 19
2021 count
36
% of total
5.6%
Change from 2016
+1.3pp
36
5.6%
+1.3pp
20 to 24
2021 count
12
% of total
1.9%
Change from 2016
+0.4pp
12
1.9%
+0.4pp
25 to 29
2021 count
22
% of total
3.4%
Change from 2016
-2.4pp
22
3.4%
-2.4pp
30 to 34
2021 count
44
% of total
6.9%
Change from 2016
-0.4pp
44
6.9%
-0.4pp
35 to 39
2021 count
33
% of total
5.2%
Change from 2016
-2.6pp
33
5.2%
-2.6pp
40 to 44
2021 count
41
% of total
6.4%
Change from 2016
+0.8pp
41
6.4%
+0.8pp
45 to 49
2021 count
55
% of total
8.6%
Change from 2016
-0.4pp
55
8.6%
-0.4pp
50 to 54
2021 count
53
% of total
8.3%
Change from 2016
-1.9pp
53
8.3%
-1.9pp
55 to 59
2021 count
62
% of total
9.7%
Change from 2016
+1.7pp
62
9.7%
+1.7pp
60 to 64
2021 count
57
% of total
8.9%
Change from 2016
-2.2pp
57
8.9%
-2.2pp
65 to 69
2021 count
57
% of total
8.9%
Change from 2016
+1.7pp
57
8.9%
+1.7pp
70 to 74
2021 count
37
% of total
5.8%
Change from 2016
+4.9pp
37
5.8%
+4.9pp
75 to 79
2021 count
6
% of total
0.9%
Change from 2016
-0.6pp
6
0.9%
-0.6pp
80 to 84
2021 count
8
% of total
1.3%
Change from 2016
-0.1pp
8
1.3%
-0.1pp
85 and over
2021 count
0
% of total
0.0%
Change from 2016
-0.5pp
0
0.0%
-0.5pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-6
-1.5pp
5 to 9
-5
-1.3pp
10 to 14
+17
+2.2pp
15 to 19
+11
+1.3pp
20 to 24
+3
+0.4pp
25 to 29
-12
-2.4pp
30 to 34
+1
-0.4pp
35 to 39
-13
-2.6pp
40 to 44
+8
+0.8pp
45 to 49
+2
-0.4pp
50 to 54
-7
-1.9pp
55 to 59
+15
+1.7pp
60 to 64
-8
-2.2pp
65 to 69
+15
+1.7pp
70 to 74
+32
+4.9pp
75 to 79
-3
-0.6pp
80 to 84
0
-0.1pp
85 and over
-3
-0.5pp
Data table
Five year age groups for Main Arm. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Byron (A).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Byron (A)% | Count | % | Byron (A)% | Count | pp | |
| 0 to 4 | 35 | 5.5% | 4.8% | 41 | 7.0% | 4.9% | -6 | -1.5pp |
| 5 to 9 | 30 | 4.7% | 5.5% | 35 | 6.0% | 5.9% | -5 | -1.3pp |
| 10 to 14 | 48 | 7.5% | 5.8% | 31 | 5.3% | 6.0% | +17 | +2.2pp |
| 15 to 19 | 36 | 5.6% | 4.7% | 25 | 4.3% | 5.1% | +11 | +1.3pp |
| 20 to 24 | 12 | 1.9% | 4.1% | 9 | 1.5% | 3.8% | +3 | +0.4pp |
| 25 to 29 | 22 | 3.4% | 5.9% | 34 | 5.8% | 5.2% | -12 | -2.4pp |
| 30 to 34 | 44 | 6.9% | 7.6% | 43 | 7.3% | 5.5% | +1 | -0.4pp |
| 35 to 39 | 33 | 5.2% | 7.3% | 46 | 7.8% | 6.3% | -13 | -2.6pp |
| 40 to 44 | 41 | 6.4% | 6.9% | 33 | 5.6% | 7.6% | +8 | +0.8pp |
| 45 to 49 | 55 | 8.6% | 7.5% | 53 | 9.0% | 7.6% | +2 | -0.4pp |
| 50 to 54 | 53 | 8.3% | 6.9% | 60 | 10.2% | 7.9% | -7 | -1.9pp |
| 55 to 59 | 62 | 9.7% | 6.9% | 47 | 8.0% | 8.7% | +15 | +1.7pp |
| 60 to 64 | 57 | 8.9% | 7.5% | 65 | 11.1% | 8.7% | -8 | -2.2pp |
| 65 to 69 | 57 | 8.9% | 7.1% | 42 | 7.2% | 6.6% | +15 | +1.7pp |
| 70 to 74 | 37 | 5.8% | 5.3% | 5 | 0.9% | 4.0% | +32 | +4.9pp |
| 75 to 79 | 6 | 0.9% | 2.9% | 9 | 1.5% | 2.4% | -3 | -0.6pp |
| 80 to 84 | 8 | 1.3% | 1.6% | 8 | 1.4% | 1.6% | 0 | -0.1pp |
| 85 and over | 0 | 0.0% | 1.6% | 3 | 0.5% | 2.2% | -3 | -0.5pp |
| Total | 640 | 100.0% | 100.0% | 586 | 100.0% | 100.0% | +54 | 0.0pp |