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, 5 to 9 year olds was the largest age group among residents in Mount Cotton, accounting for 9.2% (675 people). This share was higher than Redland (C) (5.9%). Since 2016, the biggest change was in 25 to 29 year olds, which decreased by 103 people and 1.9 percentage points.
Section overview
Age structure - Five year age groups
Mount Cotton - Total persons (Usual residence)
This table summarises five year age groups for Mount Cotton in 2021 for persons, with comparison against Redland (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Mount Cotton, with comparison markers for Redland (C).
0 to 4
2021 count
609
% of total
8.3%
Change from 2016
-1.2pp
609
8.3%
-1.2pp
5 to 9
2021 count
675
% of total
9.2%
Change from 2016
-0.2pp
675
9.2%
-0.2pp
10 to 14
2021 count
618
% of total
8.5%
Change from 2016
+0.4pp
618
8.5%
+0.4pp
15 to 19
2021 count
484
% of total
6.6%
Change from 2016
+0.8pp
484
6.6%
+0.8pp
20 to 24
2021 count
322
% of total
4.4%
Change from 2016
-0.4pp
322
4.4%
-0.4pp
25 to 29
2021 count
409
% of total
5.6%
Change from 2016
-1.9pp
409
5.6%
-1.9pp
30 to 34
2021 count
562
% of total
7.7%
Change from 2016
-1.8pp
562
7.7%
-1.8pp
35 to 39
2021 count
664
% of total
9.1%
Change from 2016
-0.2pp
664
9.1%
-0.2pp
40 to 44
2021 count
629
% of total
8.6%
Change from 2016
-0.2pp
629
8.6%
-0.2pp
45 to 49
2021 count
585
% of total
8.0%
Change from 2016
+0.8pp
585
8.0%
+0.8pp
50 to 54
2021 count
494
% of total
6.8%
Change from 2016
+0.9pp
494
6.8%
+0.9pp
55 to 59
2021 count
406
% of total
5.6%
Change from 2016
+0.8pp
406
5.6%
+0.8pp
60 to 64
2021 count
307
% of total
4.2%
Change from 2016
+0.5pp
307
4.2%
+0.5pp
65 to 69
2021 count
210
% of total
2.9%
Change from 2016
+0.6pp
210
2.9%
+0.6pp
70 to 74
2021 count
176
% of total
2.4%
Change from 2016
+0.5pp
176
2.4%
+0.5pp
75 to 79
2021 count
94
% of total
1.3%
Change from 2016
+0.4pp
94
1.3%
+0.4pp
80 to 84
2021 count
40
% of total
0.5%
Change from 2016
0.0pp
40
0.5%
0.0pp
85 and over
2021 count
29
% of total
0.4%
Change from 2016
+0.1pp
29
0.4%
+0.1pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-39
-1.2pp
5 to 9
+32
-0.2pp
10 to 14
+67
+0.4pp
15 to 19
+88
+0.8pp
20 to 24
-4
-0.4pp
25 to 29
-103
-1.9pp
30 to 34
-86
-1.8pp
35 to 39
+26
-0.2pp
40 to 44
+29
-0.2pp
45 to 49
+91
+0.8pp
50 to 54
+88
+0.9pp
55 to 59
+77
+0.8pp
60 to 64
+57
+0.5pp
65 to 69
+52
+0.6pp
70 to 74
+49
+0.5pp
75 to 79
+31
+0.4pp
80 to 84
+8
0.0pp
85 and over
+9
+0.1pp
Data table
Five year age groups for Mount Cotton. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Redland (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Redland (C)% | Count | % | Redland (C)% | Count | pp | |
| 0 to 4 | 609 | 8.3% | 5.1% | 648 | 9.5% | 5.5% | -39 | -1.2pp |
| 5 to 9 | 675 | 9.2% | 5.9% | 643 | 9.4% | 6.6% | +32 | -0.2pp |
| 10 to 14 | 618 | 8.5% | 6.8% | 551 | 8.1% | 6.7% | +67 | +0.4pp |
| 15 to 19 | 484 | 6.6% | 6.3% | 396 | 5.8% | 6.6% | +88 | +0.8pp |
| 20 to 24 | 322 | 4.4% | 5.1% | 326 | 4.8% | 5.6% | -4 | -0.4pp |
| 25 to 29 | 409 | 5.6% | 4.7% | 512 | 7.5% | 5.0% | -103 | -1.9pp |
| 30 to 34 | 562 | 7.7% | 5.4% | 648 | 9.5% | 5.7% | -86 | -1.8pp |
| 35 to 39 | 664 | 9.1% | 6.2% | 638 | 9.3% | 5.8% | +26 | -0.2pp |
| 40 to 44 | 629 | 8.6% | 6.1% | 600 | 8.8% | 6.8% | +29 | -0.2pp |
| 45 to 49 | 585 | 8.0% | 6.8% | 494 | 7.2% | 7.1% | +91 | +0.8pp |
| 50 to 54 | 494 | 6.8% | 6.9% | 406 | 5.9% | 7.3% | +88 | +0.9pp |
| 55 to 59 | 406 | 5.6% | 6.9% | 329 | 4.8% | 7.1% | +77 | +0.8pp |
| 60 to 64 | 307 | 4.2% | 6.8% | 250 | 3.7% | 6.4% | +57 | +0.5pp |
| 65 to 69 | 210 | 2.9% | 6.2% | 158 | 2.3% | 6.0% | +52 | +0.6pp |
| 70 to 74 | 176 | 2.4% | 5.7% | 127 | 1.9% | 4.5% | +49 | +0.5pp |
| 75 to 79 | 94 | 1.3% | 4.1% | 63 | 0.9% | 3.1% | +31 | +0.4pp |
| 80 to 84 | 40 | 0.5% | 2.5% | 32 | 0.5% | 2.1% | +8 | 0.0pp |
| 85 and over | 29 | 0.4% | 2.4% | 20 | 0.3% | 2.2% | +9 | +0.1pp |
| Total | 7,302 | 100.0% | 100.0% | 6,835 | 100.0% | 100.0% | +467 | 0.0pp |