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, 25 to 29 year olds was the largest age group among residents in Sydenham (Vic.), accounting for 8.3% (883 people). This share was higher than Brimbank (C) (8.1%). Since 2016, the biggest change was in 40 to 44 year olds, which decreased by 165 people and 1.3 percentage points.
Section overview
Age structure - Five year age groups
Sydenham (Vic.) - Total persons (Usual residence)
This table summarises five year age groups for Sydenham (Vic.) 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 Sydenham (Vic.), with comparison markers for Brimbank (C).
0 to 4
2021 count
588
% of total
5.6%
Change from 2016
-0.6pp
588
5.6%
-0.6pp
5 to 9
2021 count
582
% of total
5.5%
Change from 2016
-0.8pp
582
5.5%
-0.8pp
10 to 14
2021 count
580
% of total
5.5%
Change from 2016
-0.9pp
580
5.5%
-0.9pp
15 to 19
2021 count
652
% of total
6.2%
Change from 2016
-0.8pp
652
6.2%
-0.8pp
20 to 24
2021 count
828
% of total
7.8%
Change from 2016
-0.1pp
828
7.8%
-0.1pp
25 to 29
2021 count
883
% of total
8.3%
Change from 2016
-0.1pp
883
8.3%
-0.1pp
30 to 34
2021 count
846
% of total
8.0%
Change from 2016
0.0pp
846
8.0%
0.0pp
35 to 39
2021 count
748
% of total
7.1%
Change from 2016
-0.6pp
748
7.1%
-0.6pp
40 to 44
2021 count
631
% of total
6.0%
Change from 2016
-1.3pp
631
6.0%
-1.3pp
45 to 49
2021 count
726
% of total
6.9%
Change from 2016
-0.3pp
726
6.9%
-0.3pp
50 to 54
2021 count
717
% of total
6.8%
Change from 2016
-0.1pp
717
6.8%
-0.1pp
55 to 59
2021 count
736
% of total
7.0%
Change from 2016
+1.4pp
736
7.0%
+1.4pp
60 to 64
2021 count
570
% of total
5.4%
Change from 2016
+1.2pp
570
5.4%
+1.2pp
65 to 69
2021 count
431
% of total
4.1%
Change from 2016
+1.0pp
431
4.1%
+1.0pp
70 to 74
2021 count
330
% of total
3.1%
Change from 2016
+0.9pp
330
3.1%
+0.9pp
75 to 79
2021 count
251
% of total
2.4%
Change from 2016
+0.8pp
251
2.4%
+0.8pp
80 to 84
2021 count
193
% of total
1.8%
Change from 2016
+0.4pp
193
1.8%
+0.4pp
85 and over
2021 count
285
% of total
2.7%
Change from 2016
+0.4pp
285
2.7%
+0.4pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-87
-0.6pp
5 to 9
-105
-0.8pp
10 to 14
-115
-0.9pp
15 to 19
-111
-0.8pp
20 to 24
-31
-0.1pp
25 to 29
-22
-0.1pp
30 to 34
-22
0.0pp
35 to 39
-83
-0.6pp
40 to 44
-165
-1.3pp
45 to 49
-57
-0.3pp
50 to 54
-33
-0.1pp
55 to 59
+131
+1.4pp
60 to 64
+116
+1.2pp
65 to 69
+92
+1.0pp
70 to 74
+95
+0.9pp
75 to 79
+76
+0.8pp
80 to 84
+40
+0.4pp
85 and over
+38
+0.4pp
Data table
Five year age groups for Sydenham (Vic.). 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 | 588 | 5.6% | 5.6% | 675 | 6.2% | 6.7% | -87 | -0.6pp |
| 5 to 9 | 582 | 5.5% | 6.0% | 687 | 6.3% | 6.1% | -105 | -0.8pp |
| 10 to 14 | 580 | 5.5% | 5.7% | 695 | 6.4% | 5.7% | -115 | -0.9pp |
| 15 to 19 | 652 | 6.2% | 5.7% | 763 | 7.0% | 6.3% | -111 | -0.8pp |
| 20 to 24 | 828 | 7.8% | 6.9% | 859 | 7.9% | 7.8% | -31 | -0.1pp |
| 25 to 29 | 883 | 8.3% | 8.1% | 905 | 8.4% | 8.1% | -22 | -0.1pp |
| 30 to 34 | 846 | 8.0% | 7.6% | 868 | 8.0% | 8.0% | -22 | 0.0pp |
| 35 to 39 | 748 | 7.1% | 7.2% | 831 | 7.7% | 6.9% | -83 | -0.6pp |
| 40 to 44 | 631 | 6.0% | 6.4% | 796 | 7.3% | 6.6% | -165 | -1.3pp |
| 45 to 49 | 726 | 6.9% | 6.3% | 783 | 7.2% | 6.5% | -57 | -0.3pp |
| 50 to 54 | 717 | 6.8% | 6.3% | 750 | 6.9% | 6.3% | -33 | -0.1pp |
| 55 to 59 | 736 | 7.0% | 6.1% | 605 | 5.6% | 6.0% | +131 | +1.4pp |
| 60 to 64 | 570 | 5.4% | 5.8% | 454 | 4.2% | 5.4% | +116 | +1.2pp |
| 65 to 69 | 431 | 4.1% | 5.1% | 339 | 3.1% | 4.7% | +92 | +1.0pp |
| 70 to 74 | 330 | 3.1% | 4.3% | 235 | 2.2% | 3.3% | +95 | +0.9pp |
| 75 to 79 | 251 | 2.4% | 3.0% | 175 | 1.6% | 2.4% | +76 | +0.8pp |
| 80 to 84 | 193 | 1.8% | 2.0% | 153 | 1.4% | 1.7% | +40 | +0.4pp |
| 85 and over | 285 | 2.7% | 1.9% | 247 | 2.3% | 1.5% | +38 | +0.4pp |
| Total | 10,578 | 100.0% | 100.0% | 10,838 | 100.0% | 100.0% | -260 | 0.0pp |