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, 45 to 49 year olds was the largest age group among residents in Cairnlea, accounting for 8% (807 people). This share was higher than Brimbank (C) (6.3%). Since 2016, the biggest change was in 0 to 4 year olds, which decreased by 176 people and 2 percentage points.
Section overview
Age structure - Five year age groups
Cairnlea - Total persons (Usual residence)
This table summarises five year age groups for Cairnlea in 2021 for persons, with comparison against Brimbank (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Cairnlea, with comparison markers for Brimbank (C).
0 to 4
2021 count
501
% of total
5.0%
Change from 2016
-2.0pp
501
5.0%
-2.0pp
5 to 9
2021 count
730
% of total
7.3%
Change from 2016
-0.3pp
730
7.3%
-0.3pp
10 to 14
2021 count
690
% of total
6.9%
Change from 2016
-1.1pp
690
6.9%
-1.1pp
15 to 19
2021 count
788
% of total
7.9%
Change from 2016
0.0pp
788
7.9%
0.0pp
20 to 24
2021 count
765
% of total
7.6%
Change from 2016
-0.2pp
765
7.6%
-0.2pp
25 to 29
2021 count
723
% of total
7.2%
Change from 2016
+0.9pp
723
7.2%
+0.9pp
30 to 34
2021 count
597
% of total
5.9%
Change from 2016
-1.0pp
597
5.9%
-1.0pp
35 to 39
2021 count
687
% of total
6.8%
Change from 2016
-1.0pp
687
6.8%
-1.0pp
40 to 44
2021 count
743
% of total
7.4%
Change from 2016
-1.4pp
743
7.4%
-1.4pp
45 to 49
2021 count
807
% of total
8.0%
Change from 2016
0.0pp
807
8.0%
0.0pp
50 to 54
2021 count
749
% of total
7.5%
Change from 2016
+1.0pp
749
7.5%
+1.0pp
55 to 59
2021 count
627
% of total
6.2%
Change from 2016
+0.1pp
627
6.2%
+0.1pp
60 to 64
2021 count
587
% of total
5.8%
Change from 2016
+1.2pp
587
5.8%
+1.2pp
65 to 69
2021 count
429
% of total
4.3%
Change from 2016
+1.3pp
429
4.3%
+1.3pp
70 to 74
2021 count
282
% of total
2.8%
Change from 2016
+1.0pp
282
2.8%
+1.0pp
75 to 79
2021 count
158
% of total
1.6%
Change from 2016
+0.9pp
158
1.6%
+0.9pp
80 to 84
2021 count
68
% of total
0.7%
Change from 2016
+0.2pp
68
0.7%
+0.2pp
85 and over
2021 count
95
% of total
0.9%
Change from 2016
+0.4pp
95
0.9%
+0.4pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-176
-2.0pp
5 to 9
-6
-0.3pp
10 to 14
-81
-1.1pp
15 to 19
+21
0.0pp
20 to 24
+7
-0.2pp
25 to 29
+113
+0.9pp
30 to 34
-71
-1.0pp
35 to 39
-71
-1.0pp
40 to 44
-111
-1.4pp
45 to 49
+39
0.0pp
50 to 54
+123
+1.0pp
55 to 59
+37
+0.1pp
60 to 64
+145
+1.2pp
65 to 69
+139
+1.3pp
70 to 74
+111
+1.0pp
75 to 79
+88
+0.9pp
80 to 84
+18
+0.2pp
85 and over
+50
+0.4pp
Data table
Five year age groups for Cairnlea. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Brimbank (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Brimbank (C)% | Count | % | Brimbank (C)% | Count | pp | |
| 0 to 4 | 501 | 5.0% | 5.6% | 677 | 7.0% | 6.7% | -176 | -2.0pp |
| 5 to 9 | 730 | 7.3% | 6.0% | 736 | 7.6% | 6.1% | -6 | -0.3pp |
| 10 to 14 | 690 | 6.9% | 5.7% | 771 | 8.0% | 5.7% | -81 | -1.1pp |
| 15 to 19 | 788 | 7.9% | 5.7% | 767 | 7.9% | 6.3% | +21 | 0.0pp |
| 20 to 24 | 765 | 7.6% | 6.9% | 758 | 7.8% | 7.8% | +7 | -0.2pp |
| 25 to 29 | 723 | 7.2% | 8.1% | 610 | 6.3% | 8.1% | +113 | +0.9pp |
| 30 to 34 | 597 | 5.9% | 7.6% | 668 | 6.9% | 8.0% | -71 | -1.0pp |
| 35 to 39 | 687 | 6.8% | 7.2% | 758 | 7.8% | 6.9% | -71 | -1.0pp |
| 40 to 44 | 743 | 7.4% | 6.4% | 854 | 8.8% | 6.6% | -111 | -1.4pp |
| 45 to 49 | 807 | 8.0% | 6.3% | 768 | 8.0% | 6.5% | +39 | 0.0pp |
| 50 to 54 | 749 | 7.5% | 6.3% | 626 | 6.5% | 6.3% | +123 | +1.0pp |
| 55 to 59 | 627 | 6.2% | 6.1% | 590 | 6.1% | 6.0% | +37 | +0.1pp |
| 60 to 64 | 587 | 5.8% | 5.8% | 442 | 4.6% | 5.4% | +145 | +1.2pp |
| 65 to 69 | 429 | 4.3% | 5.1% | 290 | 3.0% | 4.7% | +139 | +1.3pp |
| 70 to 74 | 282 | 2.8% | 4.3% | 171 | 1.8% | 3.3% | +111 | +1.0pp |
| 75 to 79 | 158 | 1.6% | 3.0% | 70 | 0.7% | 2.4% | +88 | +0.9pp |
| 80 to 84 | 68 | 0.7% | 2.0% | 50 | 0.5% | 1.7% | +18 | +0.2pp |
| 85 and over | 95 | 0.9% | 1.9% | 45 | 0.5% | 1.5% | +50 | +0.4pp |
| Total | 10,038 | 100.0% | 100.0% | 9,657 | 100.0% | 100.0% | +381 | 0.0pp |