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, 15 to 19 year olds was the largest age group among residents in Darch, accounting for 9.7% (714 people). This share was higher than Wanneroo (C) (6.6%). Since 2016, the biggest change was in 0 to 4 year olds, which decreased by 189 people and 2.9 percentage points.
Section overview
Age structure - Five year age groups
Darch - Total persons (Usual residence)
This table summarises five year age groups for Darch in 2021 for persons, with comparison against Wanneroo (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Darch, with comparison markers for Wanneroo (C).
0 to 4
2021 count
392
% of total
5.3%
Change from 2016
-2.9pp
392
5.3%
-2.9pp
5 to 9
2021 count
569
% of total
7.7%
Change from 2016
-1.0pp
569
7.7%
-1.0pp
10 to 14
2021 count
666
% of total
9.1%
Change from 2016
-0.3pp
666
9.1%
-0.3pp
15 to 19
2021 count
714
% of total
9.7%
Change from 2016
+0.3pp
714
9.7%
+0.3pp
20 to 24
2021 count
537
% of total
7.3%
Change from 2016
+1.8pp
537
7.3%
+1.8pp
25 to 29
2021 count
329
% of total
4.5%
Change from 2016
-0.2pp
329
4.5%
-0.2pp
30 to 34
2021 count
394
% of total
5.4%
Change from 2016
-1.8pp
394
5.4%
-1.8pp
35 to 39
2021 count
536
% of total
7.3%
Change from 2016
-1.8pp
536
7.3%
-1.8pp
40 to 44
2021 count
623
% of total
8.5%
Change from 2016
-1.3pp
623
8.5%
-1.3pp
45 to 49
2021 count
663
% of total
9.0%
Change from 2016
+0.3pp
663
9.0%
+0.3pp
50 to 54
2021 count
594
% of total
8.1%
Change from 2016
+2.3pp
594
8.1%
+2.3pp
55 to 59
2021 count
423
% of total
5.8%
Change from 2016
+1.7pp
423
5.8%
+1.7pp
60 to 64
2021 count
271
% of total
3.7%
Change from 2016
+1.0pp
271
3.7%
+1.0pp
65 to 69
2021 count
194
% of total
2.6%
Change from 2016
-0.1pp
194
2.6%
-0.1pp
70 to 74
2021 count
194
% of total
2.6%
Change from 2016
+1.1pp
194
2.6%
+1.1pp
75 to 79
2021 count
122
% of total
1.7%
Change from 2016
+0.3pp
122
1.7%
+0.3pp
80 to 84
2021 count
93
% of total
1.3%
Change from 2016
+0.6pp
93
1.3%
+0.6pp
85 and over
2021 count
51
% of total
0.7%
Change from 2016
+0.4pp
51
0.7%
+0.4pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-189
-2.9pp
5 to 9
-55
-1.0pp
10 to 14
-3
-0.3pp
15 to 19
+45
+0.3pp
20 to 24
+145
+1.8pp
25 to 29
-6
-0.2pp
30 to 34
-120
-1.8pp
35 to 39
-115
-1.8pp
40 to 44
-75
-1.3pp
45 to 49
+43
+0.3pp
50 to 54
+180
+2.3pp
55 to 59
+129
+1.7pp
60 to 64
+77
+1.0pp
65 to 69
+1
-0.1pp
70 to 74
+90
+1.1pp
75 to 79
+23
+0.3pp
80 to 84
+43
+0.6pp
85 and over
+32
+0.4pp
Data table
Five year age groups for Darch. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Wanneroo (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Wanneroo (C)% | Count | % | Wanneroo (C)% | Count | pp | |
| 0 to 4 | 392 | 5.3% | 7.1% | 581 | 8.2% | 8.0% | -189 | -2.9pp |
| 5 to 9 | 569 | 7.7% | 7.6% | 624 | 8.7% | 7.9% | -55 | -1.0pp |
| 10 to 14 | 666 | 9.1% | 7.4% | 669 | 9.4% | 7.1% | -3 | -0.3pp |
| 15 to 19 | 714 | 9.7% | 6.6% | 669 | 9.4% | 7.1% | +45 | +0.3pp |
| 20 to 24 | 537 | 7.3% | 6.4% | 392 | 5.5% | 6.8% | +145 | +1.8pp |
| 25 to 29 | 329 | 4.5% | 6.5% | 335 | 4.7% | 7.5% | -6 | -0.2pp |
| 30 to 34 | 394 | 5.4% | 7.4% | 514 | 7.2% | 8.1% | -120 | -1.8pp |
| 35 to 39 | 536 | 7.3% | 7.9% | 651 | 9.1% | 7.5% | -115 | -1.8pp |
| 40 to 44 | 623 | 8.5% | 6.9% | 698 | 9.8% | 7.6% | -75 | -1.3pp |
| 45 to 49 | 663 | 9.0% | 7.0% | 620 | 8.7% | 7.4% | +43 | +0.3pp |
| 50 to 54 | 594 | 8.1% | 6.7% | 414 | 5.8% | 6.2% | +180 | +2.3pp |
| 55 to 59 | 423 | 5.8% | 5.7% | 294 | 4.1% | 5.0% | +129 | +1.7pp |
| 60 to 64 | 271 | 3.7% | 4.7% | 194 | 2.7% | 3.9% | +77 | +1.0pp |
| 65 to 69 | 194 | 2.6% | 3.8% | 193 | 2.7% | 3.5% | +1 | -0.1pp |
| 70 to 74 | 194 | 2.6% | 3.3% | 104 | 1.5% | 2.4% | +90 | +1.1pp |
| 75 to 79 | 122 | 1.7% | 2.2% | 99 | 1.4% | 1.8% | +23 | +0.3pp |
| 80 to 84 | 93 | 1.3% | 1.5% | 50 | 0.7% | 1.2% | +43 | +0.6pp |
| 85 and over | 51 | 0.7% | 1.3% | 19 | 0.3% | 1.0% | +32 | +0.4pp |
| Total | 7,347 | 100.0% | 100.0% | 7,133 | 100.0% | 100.0% | +214 | 0.0pp |