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 Banksia Grove, accounting for 10.9% (1,237 people). This share was higher than Wanneroo (C) (7.4%). Since 2016, the biggest change was in 35 to 39 year olds, which increased by 324 people and 1.2 percentage points.
Section overview
Age structure - Five year age groups
Banksia Grove - Total persons (Usual residence)
This table summarises five year age groups for Banksia Grove 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 Banksia Grove, with comparison markers for Wanneroo (C).
0 to 4
2021 count
1,120
% of total
9.9%
Change from 2016
-1.4pp
1,120
9.9%
-1.4pp
5 to 9
2021 count
1,148
% of total
10.1%
Change from 2016
+1.2pp
1,148
10.1%
+1.2pp
10 to 14
2021 count
860
% of total
7.6%
Change from 2016
+0.4pp
860
7.6%
+0.4pp
15 to 19
2021 count
743
% of total
6.5%
Change from 2016
0.0pp
743
6.5%
0.0pp
20 to 24
2021 count
708
% of total
6.2%
Change from 2016
-1.5pp
708
6.2%
-1.5pp
25 to 29
2021 count
1,022
% of total
9.0%
Change from 2016
-3.3pp
1,022
9.0%
-3.3pp
30 to 34
2021 count
1,237
% of total
10.9%
Change from 2016
-1.7pp
1,237
10.9%
-1.7pp
35 to 39
2021 count
1,161
% of total
10.2%
Change from 2016
+1.2pp
1,161
10.2%
+1.2pp
40 to 44
2021 count
855
% of total
7.5%
Change from 2016
+0.6pp
855
7.5%
+0.6pp
45 to 49
2021 count
673
% of total
5.9%
Change from 2016
+0.4pp
673
5.9%
+0.4pp
50 to 54
2021 count
584
% of total
5.1%
Change from 2016
+0.8pp
584
5.1%
+0.8pp
55 to 59
2021 count
418
% of total
3.7%
Change from 2016
+0.6pp
418
3.7%
+0.6pp
60 to 64
2021 count
325
% of total
2.9%
Change from 2016
+0.8pp
325
2.9%
+0.8pp
65 to 69
2021 count
214
% of total
1.9%
Change from 2016
+0.6pp
214
1.9%
+0.6pp
70 to 74
2021 count
153
% of total
1.3%
Change from 2016
+0.7pp
153
1.3%
+0.7pp
75 to 79
2021 count
66
% of total
0.6%
Change from 2016
+0.3pp
66
0.6%
+0.3pp
80 to 84
2021 count
36
% of total
0.3%
Change from 2016
+0.1pp
36
0.3%
+0.1pp
85 and over
2021 count
21
% of total
0.2%
Change from 2016
0.0pp
21
0.2%
0.0pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+66
-1.4pp
5 to 9
+315
+1.2pp
10 to 14
+189
+0.4pp
15 to 19
+135
0.0pp
20 to 24
-13
-1.5pp
25 to 29
-131
-3.3pp
30 to 34
+60
-1.7pp
35 to 39
+324
+1.2pp
40 to 44
+209
+0.6pp
45 to 49
+157
+0.4pp
50 to 54
+182
+0.8pp
55 to 59
+131
+0.6pp
60 to 64
+128
+0.8pp
65 to 69
+93
+0.6pp
70 to 74
+95
+0.7pp
75 to 79
+34
+0.3pp
80 to 84
+19
+0.1pp
85 and over
+2
0.0pp
Data table
Five year age groups for Banksia Grove. 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 | 1,120 | 9.9% | 7.1% | 1,054 | 11.3% | 8.0% | +66 | -1.4pp |
| 5 to 9 | 1,148 | 10.1% | 7.6% | 833 | 8.9% | 7.9% | +315 | +1.2pp |
| 10 to 14 | 860 | 7.6% | 7.4% | 671 | 7.2% | 7.1% | +189 | +0.4pp |
| 15 to 19 | 743 | 6.5% | 6.6% | 608 | 6.5% | 7.1% | +135 | 0.0pp |
| 20 to 24 | 708 | 6.2% | 6.4% | 721 | 7.7% | 6.8% | -13 | -1.5pp |
| 25 to 29 | 1,022 | 9.0% | 6.5% | 1,153 | 12.3% | 7.5% | -131 | -3.3pp |
| 30 to 34 | 1,237 | 10.9% | 7.4% | 1,177 | 12.6% | 8.1% | +60 | -1.7pp |
| 35 to 39 | 1,161 | 10.2% | 7.9% | 837 | 9.0% | 7.5% | +324 | +1.2pp |
| 40 to 44 | 855 | 7.5% | 6.9% | 646 | 6.9% | 7.6% | +209 | +0.6pp |
| 45 to 49 | 673 | 5.9% | 7.0% | 516 | 5.5% | 7.4% | +157 | +0.4pp |
| 50 to 54 | 584 | 5.1% | 6.7% | 402 | 4.3% | 6.2% | +182 | +0.8pp |
| 55 to 59 | 418 | 3.7% | 5.7% | 287 | 3.1% | 5.0% | +131 | +0.6pp |
| 60 to 64 | 325 | 2.9% | 4.7% | 197 | 2.1% | 3.9% | +128 | +0.8pp |
| 65 to 69 | 214 | 1.9% | 3.8% | 121 | 1.3% | 3.5% | +93 | +0.6pp |
| 70 to 74 | 153 | 1.3% | 3.3% | 58 | 0.6% | 2.4% | +95 | +0.7pp |
| 75 to 79 | 66 | 0.6% | 2.2% | 32 | 0.3% | 1.8% | +34 | +0.3pp |
| 80 to 84 | 36 | 0.3% | 1.5% | 17 | 0.2% | 1.2% | +19 | +0.1pp |
| 85 and over | 21 | 0.2% | 1.3% | 19 | 0.2% | 1.0% | +2 | 0.0pp |
| Total | 11,351 | 100.0% | 100.0% | 9,350 | 100.0% | 100.0% | +2,001 | 0.0pp |