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 Ardeer, accounting for 10.2% (323 people). This share was higher than Brimbank (C) (7.6%). Since 2016, the biggest change was in 35 to 39 year olds, which increased by 97 people and 2.9 percentage points.
Section overview
Age structure - Five year age groups
Ardeer - Total persons (Usual residence)
This table summarises five year age groups for Ardeer 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 Ardeer, with comparison markers for Brimbank (C).
0 to 4
2021 count
226
% of total
7.1%
Change from 2016
-0.1pp
226
7.1%
-0.1pp
5 to 9
2021 count
180
% of total
5.7%
Change from 2016
+0.2pp
180
5.7%
+0.2pp
10 to 14
2021 count
144
% of total
4.5%
Change from 2016
-0.7pp
144
4.5%
-0.7pp
15 to 19
2021 count
127
% of total
4.0%
Change from 2016
-0.4pp
127
4.0%
-0.4pp
20 to 24
2021 count
158
% of total
5.0%
Change from 2016
-1.4pp
158
5.0%
-1.4pp
25 to 29
2021 count
281
% of total
8.9%
Change from 2016
-0.1pp
281
8.9%
-0.1pp
30 to 34
2021 count
323
% of total
10.2%
Change from 2016
-1.0pp
323
10.2%
-1.0pp
35 to 39
2021 count
304
% of total
9.6%
Change from 2016
+2.9pp
304
9.6%
+2.9pp
40 to 44
2021 count
249
% of total
7.9%
Change from 2016
+0.6pp
249
7.9%
+0.6pp
45 to 49
2021 count
220
% of total
6.9%
Change from 2016
+1.8pp
220
6.9%
+1.8pp
50 to 54
2021 count
177
% of total
5.6%
Change from 2016
+0.4pp
177
5.6%
+0.4pp
55 to 59
2021 count
143
% of total
4.5%
Change from 2016
-0.5pp
143
4.5%
-0.5pp
60 to 64
2021 count
135
% of total
4.3%
Change from 2016
-0.3pp
135
4.3%
-0.3pp
65 to 69
2021 count
132
% of total
4.2%
Change from 2016
-0.4pp
132
4.2%
-0.4pp
70 to 74
2021 count
127
% of total
4.0%
Change from 2016
+0.6pp
127
4.0%
+0.6pp
75 to 79
2021 count
89
% of total
2.8%
Change from 2016
+0.2pp
89
2.8%
+0.2pp
80 to 84
2021 count
62
% of total
2.0%
Change from 2016
-0.2pp
62
2.0%
-0.2pp
85 and over
2021 count
114
% of total
3.6%
Change from 2016
-0.2pp
114
3.6%
-0.2pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+2
-0.1pp
5 to 9
+8
+0.2pp
10 to 14
-16
-0.7pp
15 to 19
-10
-0.4pp
20 to 24
-40
-1.4pp
25 to 29
+3
-0.1pp
30 to 34
-26
-1.0pp
35 to 39
+97
+2.9pp
40 to 44
+22
+0.6pp
45 to 49
+61
+1.8pp
50 to 54
+17
+0.4pp
55 to 59
-11
-0.5pp
60 to 64
-8
-0.3pp
65 to 69
-10
-0.4pp
70 to 74
+21
+0.6pp
75 to 79
+7
+0.2pp
80 to 84
-7
-0.2pp
85 and over
-3
-0.2pp
Data table
Five year age groups for Ardeer. 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 | 226 | 7.1% | 5.6% | 224 | 7.2% | 6.7% | +2 | -0.1pp |
| 5 to 9 | 180 | 5.7% | 6.0% | 172 | 5.5% | 6.1% | +8 | +0.2pp |
| 10 to 14 | 144 | 4.5% | 5.7% | 160 | 5.2% | 5.7% | -16 | -0.7pp |
| 15 to 19 | 127 | 4.0% | 5.7% | 137 | 4.4% | 6.3% | -10 | -0.4pp |
| 20 to 24 | 158 | 5.0% | 6.9% | 198 | 6.4% | 7.8% | -40 | -1.4pp |
| 25 to 29 | 281 | 8.9% | 8.1% | 278 | 9.0% | 8.1% | +3 | -0.1pp |
| 30 to 34 | 323 | 10.2% | 7.6% | 349 | 11.2% | 8.0% | -26 | -1.0pp |
| 35 to 39 | 304 | 9.6% | 7.2% | 207 | 6.7% | 6.9% | +97 | +2.9pp |
| 40 to 44 | 249 | 7.9% | 6.4% | 227 | 7.3% | 6.6% | +22 | +0.6pp |
| 45 to 49 | 220 | 6.9% | 6.3% | 159 | 5.1% | 6.5% | +61 | +1.8pp |
| 50 to 54 | 177 | 5.6% | 6.3% | 160 | 5.2% | 6.3% | +17 | +0.4pp |
| 55 to 59 | 143 | 4.5% | 6.1% | 154 | 5.0% | 6.0% | -11 | -0.5pp |
| 60 to 64 | 135 | 4.3% | 5.8% | 143 | 4.6% | 5.4% | -8 | -0.3pp |
| 65 to 69 | 132 | 4.2% | 5.1% | 142 | 4.6% | 4.7% | -10 | -0.4pp |
| 70 to 74 | 127 | 4.0% | 4.3% | 106 | 3.4% | 3.3% | +21 | +0.6pp |
| 75 to 79 | 89 | 2.8% | 3.0% | 82 | 2.6% | 2.4% | +7 | +0.2pp |
| 80 to 84 | 62 | 2.0% | 2.0% | 69 | 2.2% | 1.7% | -7 | -0.2pp |
| 85 and over | 114 | 3.6% | 1.9% | 117 | 3.8% | 1.5% | -3 | -0.2pp |
| Total | 3,170 | 100.0% | 100.0% | 3,103 | 100.0% | 100.0% | +67 | 0.0pp |