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 Alderley, accounting for 9.5% (642 people). This share was higher than Brisbane (C) (8.4%). Since 2016, the biggest change was in 35 to 39 year olds, which increased by 119 people and 1.1 percentage points.
Section overview
Age structure - Five year age groups
Alderley - Total persons (Usual residence)
This table summarises five year age groups for Alderley in 2021 for persons, with comparison against Brisbane (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Alderley, with comparison markers for Brisbane (C).
0 to 4
2021 count
383
% of total
5.7%
Change from 2016
-0.5pp
383
5.7%
-0.5pp
5 to 9
2021 count
356
% of total
5.3%
Change from 2016
-1.0pp
356
5.3%
-1.0pp
10 to 14
2021 count
413
% of total
6.1%
Change from 2016
+0.5pp
413
6.1%
+0.5pp
15 to 19
2021 count
415
% of total
6.1%
Change from 2016
+0.8pp
415
6.1%
+0.8pp
20 to 24
2021 count
584
% of total
8.7%
Change from 2016
-1.6pp
584
8.7%
-1.6pp
25 to 29
2021 count
642
% of total
9.5%
Change from 2016
+0.1pp
642
9.5%
+0.1pp
30 to 34
2021 count
592
% of total
8.8%
Change from 2016
-0.2pp
592
8.8%
-0.2pp
35 to 39
2021 count
575
% of total
8.5%
Change from 2016
+1.1pp
575
8.5%
+1.1pp
40 to 44
2021 count
503
% of total
7.5%
Change from 2016
-0.4pp
503
7.5%
-0.4pp
45 to 49
2021 count
523
% of total
7.8%
Change from 2016
0.0pp
523
7.8%
0.0pp
50 to 54
2021 count
478
% of total
7.1%
Change from 2016
+0.8pp
478
7.1%
+0.8pp
55 to 59
2021 count
348
% of total
5.2%
Change from 2016
+0.8pp
348
5.2%
+0.8pp
60 to 64
2021 count
282
% of total
4.2%
Change from 2016
+0.1pp
282
4.2%
+0.1pp
65 to 69
2021 count
218
% of total
3.2%
Change from 2016
-0.4pp
218
3.2%
-0.4pp
70 to 74
2021 count
191
% of total
2.8%
Change from 2016
+0.3pp
191
2.8%
+0.3pp
75 to 79
2021 count
135
% of total
2.0%
Change from 2016
+0.3pp
135
2.0%
+0.3pp
80 to 84
2021 count
73
% of total
1.1%
Change from 2016
0.0pp
73
1.1%
0.0pp
85 and over
2021 count
58
% of total
0.9%
Change from 2016
-0.2pp
58
0.9%
-0.2pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
0
-0.5pp
5 to 9
-34
-1.0pp
10 to 14
+70
+0.5pp
15 to 19
+91
+0.8pp
20 to 24
-48
-1.6pp
25 to 29
+61
+0.1pp
30 to 34
+39
-0.2pp
35 to 39
+119
+1.1pp
40 to 44
+16
-0.4pp
45 to 49
+40
0.0pp
50 to 54
+92
+0.8pp
55 to 59
+77
+0.8pp
60 to 64
+29
+0.1pp
65 to 69
-2
-0.4pp
70 to 74
+35
+0.3pp
75 to 79
+31
+0.3pp
80 to 84
+5
0.0pp
85 and over
-13
-0.2pp
Data table
Five year age groups for Alderley. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Brisbane (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Brisbane (C)% | Count | % | Brisbane (C)% | Count | pp | |
| 0 to 4 | 383 | 5.7% | 5.5% | 383 | 6.2% | 6.0% | 0 | -0.5pp |
| 5 to 9 | 356 | 5.3% | 6.0% | 390 | 6.3% | 6.0% | -34 | -1.0pp |
| 10 to 14 | 413 | 6.1% | 6.0% | 343 | 5.6% | 5.6% | +70 | +0.5pp |
| 15 to 19 | 415 | 6.1% | 6.0% | 324 | 5.3% | 6.2% | +91 | +0.8pp |
| 20 to 24 | 584 | 8.7% | 7.8% | 632 | 10.3% | 8.7% | -48 | -1.6pp |
| 25 to 29 | 642 | 9.5% | 8.4% | 581 | 9.4% | 8.8% | +61 | +0.1pp |
| 30 to 34 | 592 | 8.8% | 8.3% | 553 | 9.0% | 8.5% | +39 | -0.2pp |
| 35 to 39 | 575 | 8.5% | 8.1% | 456 | 7.4% | 7.4% | +119 | +1.1pp |
| 40 to 44 | 503 | 7.5% | 7.1% | 487 | 7.9% | 7.3% | +16 | -0.4pp |
| 45 to 49 | 523 | 7.8% | 6.8% | 483 | 7.8% | 6.9% | +40 | 0.0pp |
| 50 to 54 | 478 | 7.1% | 6.3% | 386 | 6.3% | 6.1% | +92 | +0.8pp |
| 55 to 59 | 348 | 5.2% | 5.5% | 271 | 4.4% | 5.4% | +77 | +0.8pp |
| 60 to 64 | 282 | 4.2% | 4.8% | 253 | 4.1% | 4.6% | +29 | +0.1pp |
| 65 to 69 | 218 | 3.2% | 4.0% | 220 | 3.6% | 4.0% | -2 | -0.4pp |
| 70 to 74 | 191 | 2.8% | 3.5% | 156 | 2.5% | 2.9% | +35 | +0.3pp |
| 75 to 79 | 135 | 2.0% | 2.5% | 104 | 1.7% | 2.2% | +31 | +0.3pp |
| 80 to 84 | 73 | 1.1% | 1.7% | 68 | 1.1% | 1.6% | +5 | 0.0pp |
| 85 and over | 58 | 0.9% | 1.8% | 71 | 1.1% | 1.8% | -13 | -0.2pp |
| Total | 6,748 | 100.0% | 100.0% | 6,161 | 100.0% | 100.0% | +587 | 0.0pp |