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, 50 to 54 year olds was the largest age group among residents in Cottesloe (T), accounting for 8% (634 people). This share was higher than Greater Perth (6.4%). Since 2016, the biggest change was in 75 to 79 year olds, which increased by 159 people and 1.8 percentage points.
Section overview
Age structure - Five year age groups
Cottesloe (T) - Total persons (Usual residence)
This table summarises five year age groups for Cottesloe (T) in 2021 for persons, with comparison against Greater Perth and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Cottesloe (T), with comparison markers for Greater Perth.
0 to 4
2021 count
352
% of total
4.4%
Change from 2016
-0.1pp
352
4.4%
-0.1pp
5 to 9
2021 count
390
% of total
4.9%
Change from 2016
-1.2pp
390
4.9%
-1.2pp
10 to 14
2021 count
508
% of total
6.4%
Change from 2016
-0.7pp
508
6.4%
-0.7pp
15 to 19
2021 count
566
% of total
7.1%
Change from 2016
+1.1pp
566
7.1%
+1.1pp
20 to 24
2021 count
460
% of total
5.8%
Change from 2016
+0.5pp
460
5.8%
+0.5pp
25 to 29
2021 count
480
% of total
6.0%
Change from 2016
-0.6pp
480
6.0%
-0.6pp
30 to 34
2021 count
428
% of total
5.4%
Change from 2016
-0.7pp
428
5.4%
-0.7pp
35 to 39
2021 count
414
% of total
5.2%
Change from 2016
-0.3pp
414
5.2%
-0.3pp
40 to 44
2021 count
434
% of total
5.4%
Change from 2016
-0.1pp
434
5.4%
-0.1pp
45 to 49
2021 count
469
% of total
5.9%
Change from 2016
-1.8pp
469
5.9%
-1.8pp
50 to 54
2021 count
634
% of total
8.0%
Change from 2016
+0.8pp
634
8.0%
+0.8pp
55 to 59
2021 count
579
% of total
7.3%
Change from 2016
-0.2pp
579
7.3%
-0.2pp
60 to 64
2021 count
540
% of total
6.8%
Change from 2016
+0.1pp
540
6.8%
+0.1pp
65 to 69
2021 count
498
% of total
6.2%
Change from 2016
+0.4pp
498
6.2%
+0.4pp
70 to 74
2021 count
464
% of total
5.8%
Change from 2016
+0.9pp
464
5.8%
+0.9pp
75 to 79
2021 count
378
% of total
4.7%
Change from 2016
+1.8pp
378
4.7%
+1.8pp
80 to 84
2021 count
198
% of total
2.5%
Change from 2016
+0.7pp
198
2.5%
+0.7pp
85 and over
2021 count
218
% of total
2.7%
Change from 2016
-0.3pp
218
2.7%
-0.3pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+8
-0.1pp
5 to 9
-73
-1.2pp
10 to 14
-34
-0.7pp
15 to 19
+107
+1.1pp
20 to 24
+57
+0.5pp
25 to 29
-20
-0.6pp
30 to 34
-38
-0.7pp
35 to 39
-1
-0.3pp
40 to 44
+15
-0.1pp
45 to 49
-114
-1.8pp
50 to 54
+84
+0.8pp
55 to 59
+13
-0.2pp
60 to 64
+30
+0.1pp
65 to 69
+55
+0.4pp
70 to 74
+92
+0.9pp
75 to 79
+159
+1.8pp
80 to 84
+58
+0.7pp
85 and over
-11
-0.3pp
Data table
Five year age groups for Cottesloe (T). Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Greater Perth.
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Greater Perth% | Count | % | Greater Perth% | Count | pp | |
| 0 to 4 | 352 | 4.4% | 6.1% | 344 | 4.5% | 6.5% | +8 | -0.1pp |
| 5 to 9 | 390 | 4.9% | 6.4% | 463 | 6.1% | 6.5% | -73 | -1.2pp |
| 10 to 14 | 508 | 6.4% | 6.4% | 542 | 7.1% | 6.0% | -34 | -0.7pp |
| 15 to 19 | 566 | 7.1% | 5.8% | 459 | 6.0% | 6.2% | +107 | +1.1pp |
| 20 to 24 | 460 | 5.8% | 6.3% | 403 | 5.3% | 6.9% | +57 | +0.5pp |
| 25 to 29 | 480 | 6.0% | 6.8% | 500 | 6.6% | 7.7% | -20 | -0.6pp |
| 30 to 34 | 428 | 5.4% | 7.6% | 466 | 6.1% | 8.0% | -38 | -0.7pp |
| 35 to 39 | 414 | 5.2% | 7.7% | 415 | 5.5% | 7.1% | -1 | -0.3pp |
| 40 to 44 | 434 | 5.4% | 6.8% | 419 | 5.5% | 6.9% | +15 | -0.1pp |
| 45 to 49 | 469 | 5.9% | 6.5% | 583 | 7.7% | 6.9% | -114 | -1.8pp |
| 50 to 54 | 634 | 8.0% | 6.4% | 550 | 7.2% | 6.4% | +84 | +0.8pp |
| 55 to 59 | 579 | 7.3% | 5.9% | 566 | 7.5% | 5.8% | +13 | -0.2pp |
| 60 to 64 | 540 | 6.8% | 5.4% | 510 | 6.7% | 5.1% | +30 | +0.1pp |
| 65 to 69 | 498 | 6.2% | 4.8% | 443 | 5.8% | 4.6% | +55 | +0.4pp |
| 70 to 74 | 464 | 5.8% | 4.2% | 372 | 4.9% | 3.3% | +92 | +0.9pp |
| 75 to 79 | 378 | 4.7% | 2.9% | 219 | 2.9% | 2.5% | +159 | +1.8pp |
| 80 to 84 | 198 | 2.5% | 2.0% | 140 | 1.8% | 1.7% | +58 | +0.7pp |
| 85 and over | 218 | 2.7% | 1.9% | 229 | 3.0% | 1.8% | -11 | -0.3pp |
| Total | 7,970 | 100.0% | 100.0% | 7,597 | 100.0% | 100.0% | +373 | 0.0pp |