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 Donnybrook (Vic.), accounting for 18% (379 people). This share was higher than Whittlesea (C) (8.5%). Since 2016, the biggest change was in 30 to 34 year olds, which increased by 371 people and 13.3 percentage points.
Section overview
Age structure - Five year age groups
Donnybrook (Vic.) - Total persons (Usual residence)
This table summarises five year age groups for Donnybrook (Vic.) in 2021 for persons, with comparison against Whittlesea (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Donnybrook (Vic.), with comparison markers for Whittlesea (C).
0 to 4
2021 count
247
% of total
11.8%
Change from 2016
+11.8pp
247
11.8%
+11.8pp
5 to 9
2021 count
176
% of total
8.4%
Change from 2016
+8.4pp
176
8.4%
+8.4pp
10 to 14
2021 count
100
% of total
4.8%
Change from 2016
-1.7pp
100
4.8%
-1.7pp
15 to 19
2021 count
74
% of total
3.5%
Change from 2016
-3.6pp
74
3.5%
-3.6pp
20 to 24
2021 count
138
% of total
6.6%
Change from 2016
+2.5pp
138
6.6%
+2.5pp
25 to 29
2021 count
285
% of total
13.6%
Change from 2016
+7.1pp
285
13.6%
+7.1pp
30 to 34
2021 count
379
% of total
18.0%
Change from 2016
+13.3pp
379
18.0%
+13.3pp
35 to 39
2021 count
299
% of total
14.2%
Change from 2016
+12.4pp
299
14.2%
+12.4pp
40 to 44
2021 count
120
% of total
5.7%
Change from 2016
-0.8pp
120
5.7%
-0.8pp
45 to 49
2021 count
58
% of total
2.8%
Change from 2016
-4.9pp
58
2.8%
-4.9pp
50 to 54
2021 count
70
% of total
3.3%
Change from 2016
-2.0pp
70
3.3%
-2.0pp
55 to 59
2021 count
48
% of total
2.3%
Change from 2016
-7.2pp
48
2.3%
-7.2pp
60 to 64
2021 count
46
% of total
2.2%
Change from 2016
-6.1pp
46
2.2%
-6.1pp
65 to 69
2021 count
33
% of total
1.6%
Change from 2016
-2.5pp
33
1.6%
-2.5pp
70 to 74
2021 count
17
% of total
0.8%
Change from 2016
-5.1pp
17
0.8%
-5.1pp
75 to 79
2021 count
5
% of total
0.2%
Change from 2016
-3.9pp
5
0.2%
-3.9pp
80 to 84
2021 count
0
% of total
0.0%
Change from 2016
-4.7pp
0
0.0%
-4.7pp
85 and over
2021 count
6
% of total
0.3%
Change from 2016
-1.5pp
6
0.3%
-1.5pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+247
+11.8pp
5 to 9
+176
+8.4pp
10 to 14
+89
-1.7pp
15 to 19
+62
-3.6pp
20 to 24
+131
+2.5pp
25 to 29
+274
+7.1pp
30 to 34
+371
+13.3pp
35 to 39
+296
+12.4pp
40 to 44
+109
-0.8pp
45 to 49
+45
-4.9pp
50 to 54
+61
-2.0pp
55 to 59
+32
-7.2pp
60 to 64
+32
-6.1pp
65 to 69
+26
-2.5pp
70 to 74
+7
-5.1pp
75 to 79
-2
-3.9pp
80 to 84
-8
-4.7pp
85 and over
+3
-1.5pp
Data table
Five year age groups for Donnybrook (Vic.). Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Whittlesea (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Whittlesea (C)% | Count | % | Whittlesea (C)% | Count | pp | |
| 0 to 4 | 247 | 11.8% | 7.2% | 0 | 0.0% | 8.2% | +247 | +11.8pp |
| 5 to 9 | 176 | 8.4% | 7.5% | 0 | 0.0% | 7.1% | +176 | +8.4pp |
| 10 to 14 | 100 | 4.8% | 6.5% | 11 | 6.5% | 6.1% | +89 | -1.7pp |
| 15 to 19 | 74 | 3.5% | 5.7% | 12 | 7.1% | 5.9% | +62 | -3.6pp |
| 20 to 24 | 138 | 6.6% | 6.3% | 7 | 4.1% | 6.9% | +131 | +2.5pp |
| 25 to 29 | 285 | 13.6% | 7.2% | 11 | 6.5% | 8.0% | +274 | +7.1pp |
| 30 to 34 | 379 | 18.0% | 8.5% | 8 | 4.7% | 9.1% | +371 | +13.3pp |
| 35 to 39 | 299 | 14.2% | 8.9% | 3 | 1.8% | 7.9% | +296 | +12.4pp |
| 40 to 44 | 120 | 5.7% | 7.3% | 11 | 6.5% | 7.0% | +109 | -0.8pp |
| 45 to 49 | 58 | 2.8% | 6.4% | 13 | 7.7% | 6.5% | +45 | -4.9pp |
| 50 to 54 | 70 | 3.3% | 5.8% | 9 | 5.3% | 5.9% | +61 | -2.0pp |
| 55 to 59 | 48 | 2.3% | 5.2% | 16 | 9.5% | 5.2% | +32 | -7.2pp |
| 60 to 64 | 46 | 2.2% | 4.7% | 14 | 8.3% | 4.6% | +32 | -6.1pp |
| 65 to 69 | 33 | 1.6% | 4.0% | 7 | 4.1% | 4.0% | +26 | -2.5pp |
| 70 to 74 | 17 | 0.8% | 3.5% | 10 | 5.9% | 2.8% | +7 | -5.1pp |
| 75 to 79 | 5 | 0.2% | 2.3% | 7 | 4.1% | 2.1% | -2 | -3.9pp |
| 80 to 84 | 0 | 0.0% | 1.6% | 8 | 4.7% | 1.6% | -8 | -4.7pp |
| 85 and over | 6 | 0.3% | 1.5% | 3 | 1.8% | 1.2% | +3 | -1.5pp |
| Total | 2,100 | 100.0% | 100.0% | 169 | 100.0% | 100.0% | +1,931 | 0.0pp |