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 Delahey, accounting for 7.9% (642 people). This share was similar to Brimbank (C) (8.1%). Since 2016, the biggest change was in 20 to 24 year olds, which decreased by 162 people and 1.7 percentage points.
Section overview
Age structure - Five year age groups
Delahey - Total persons (Usual residence)
This table summarises five year age groups for Delahey 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 Delahey, with comparison markers for Brimbank (C).
0 to 4
2021 count
445
% of total
5.5%
Change from 2016
-0.1pp
445
5.5%
-0.1pp
5 to 9
2021 count
435
% of total
5.4%
Change from 2016
-0.3pp
435
5.4%
-0.3pp
10 to 14
2021 count
424
% of total
5.2%
Change from 2016
-0.9pp
424
5.2%
-0.9pp
15 to 19
2021 count
476
% of total
5.9%
Change from 2016
-1.4pp
476
5.9%
-1.4pp
20 to 24
2021 count
584
% of total
7.2%
Change from 2016
-1.7pp
584
7.2%
-1.7pp
25 to 29
2021 count
642
% of total
7.9%
Change from 2016
+0.7pp
642
7.9%
+0.7pp
30 to 34
2021 count
568
% of total
7.0%
Change from 2016
-0.3pp
568
7.0%
-0.3pp
35 to 39
2021 count
532
% of total
6.6%
Change from 2016
+1.0pp
532
6.6%
+1.0pp
40 to 44
2021 count
419
% of total
5.2%
Change from 2016
-1.0pp
419
5.2%
-1.0pp
45 to 49
2021 count
484
% of total
6.0%
Change from 2016
-1.7pp
484
6.0%
-1.7pp
50 to 54
2021 count
609
% of total
7.5%
Change from 2016
-0.4pp
609
7.5%
-0.4pp
55 to 59
2021 count
608
% of total
7.5%
Change from 2016
+0.3pp
608
7.5%
+0.3pp
60 to 64
2021 count
583
% of total
7.2%
Change from 2016
+1.3pp
583
7.2%
+1.3pp
65 to 69
2021 count
484
% of total
6.0%
Change from 2016
+1.9pp
484
6.0%
+1.9pp
70 to 74
2021 count
352
% of total
4.4%
Change from 2016
+1.4pp
352
4.4%
+1.4pp
75 to 79
2021 count
211
% of total
2.6%
Change from 2016
+0.9pp
211
2.6%
+0.9pp
80 to 84
2021 count
116
% of total
1.4%
Change from 2016
+0.3pp
116
1.4%
+0.3pp
85 and over
2021 count
104
% of total
1.3%
Change from 2016
+0.1pp
104
1.3%
+0.1pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-18
-0.1pp
5 to 9
-41
-0.3pp
10 to 14
-81
-0.9pp
15 to 19
-135
-1.4pp
20 to 24
-162
-1.7pp
25 to 29
+43
+0.7pp
30 to 34
-39
-0.3pp
35 to 39
+66
+1.0pp
40 to 44
-101
-1.0pp
45 to 49
-160
-1.7pp
50 to 54
-53
-0.4pp
55 to 59
+11
+0.3pp
60 to 64
+92
+1.3pp
65 to 69
+145
+1.9pp
70 to 74
+101
+1.4pp
75 to 79
+72
+0.9pp
80 to 84
+23
+0.3pp
85 and over
+3
+0.1pp
Data table
Five year age groups for Delahey. 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 | 445 | 5.5% | 5.6% | 463 | 5.6% | 6.7% | -18 | -0.1pp |
| 5 to 9 | 435 | 5.4% | 6.0% | 476 | 5.7% | 6.1% | -41 | -0.3pp |
| 10 to 14 | 424 | 5.2% | 5.7% | 505 | 6.1% | 5.7% | -81 | -0.9pp |
| 15 to 19 | 476 | 5.9% | 5.7% | 611 | 7.3% | 6.3% | -135 | -1.4pp |
| 20 to 24 | 584 | 7.2% | 6.9% | 746 | 8.9% | 7.8% | -162 | -1.7pp |
| 25 to 29 | 642 | 7.9% | 8.1% | 599 | 7.2% | 8.1% | +43 | +0.7pp |
| 30 to 34 | 568 | 7.0% | 7.6% | 607 | 7.3% | 8.0% | -39 | -0.3pp |
| 35 to 39 | 532 | 6.6% | 7.2% | 466 | 5.6% | 6.9% | +66 | +1.0pp |
| 40 to 44 | 419 | 5.2% | 6.4% | 520 | 6.2% | 6.6% | -101 | -1.0pp |
| 45 to 49 | 484 | 6.0% | 6.3% | 644 | 7.7% | 6.5% | -160 | -1.7pp |
| 50 to 54 | 609 | 7.5% | 6.3% | 662 | 7.9% | 6.3% | -53 | -0.4pp |
| 55 to 59 | 608 | 7.5% | 6.1% | 597 | 7.2% | 6.0% | +11 | +0.3pp |
| 60 to 64 | 583 | 7.2% | 5.8% | 491 | 5.9% | 5.4% | +92 | +1.3pp |
| 65 to 69 | 484 | 6.0% | 5.1% | 339 | 4.1% | 4.7% | +145 | +1.9pp |
| 70 to 74 | 352 | 4.4% | 4.3% | 251 | 3.0% | 3.3% | +101 | +1.4pp |
| 75 to 79 | 211 | 2.6% | 3.0% | 139 | 1.7% | 2.4% | +72 | +0.9pp |
| 80 to 84 | 116 | 1.4% | 2.0% | 93 | 1.1% | 1.7% | +23 | +0.3pp |
| 85 and over | 104 | 1.3% | 1.9% | 101 | 1.2% | 1.5% | +3 | +0.1pp |
| Total | 8,077 | 100.0% | 100.0% | 8,339 | 100.0% | 100.0% | -262 | 0.0pp |