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 Eight Mile Plains, accounting for 8.9% (1,362 people). This share was higher than Brisbane (C) (8.3%). Since 2016, the biggest change was in 20 to 24 year olds, which decreased by 346 people and 2.2 percentage points.
Section overview
Age structure - Five year age groups
Eight Mile Plains - Total persons (Usual residence)
This table summarises five year age groups for Eight Mile Plains 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 Eight Mile Plains, with comparison markers for Brisbane (C).
0 to 4
2021 count
901
% of total
5.9%
Change from 2016
-0.2pp
901
5.9%
-0.2pp
5 to 9
2021 count
946
% of total
6.2%
Change from 2016
+0.2pp
946
6.2%
+0.2pp
10 to 14
2021 count
843
% of total
5.5%
Change from 2016
+0.8pp
843
5.5%
+0.8pp
15 to 19
2021 count
774
% of total
5.1%
Change from 2016
-0.5pp
774
5.1%
-0.5pp
20 to 24
2021 count
1,145
% of total
7.5%
Change from 2016
-2.2pp
1,145
7.5%
-2.2pp
25 to 29
2021 count
1,284
% of total
8.4%
Change from 2016
-1.8pp
1,284
8.4%
-1.8pp
30 to 34
2021 count
1,362
% of total
8.9%
Change from 2016
-0.3pp
1,362
8.9%
-0.3pp
35 to 39
2021 count
1,263
% of total
8.2%
Change from 2016
+0.5pp
1,263
8.2%
+0.5pp
40 to 44
2021 count
1,102
% of total
7.2%
Change from 2016
+1.1pp
1,102
7.2%
+1.1pp
45 to 49
2021 count
893
% of total
5.8%
Change from 2016
0.0pp
893
5.8%
0.0pp
50 to 54
2021 count
852
% of total
5.6%
Change from 2016
+0.2pp
852
5.6%
+0.2pp
55 to 59
2021 count
795
% of total
5.2%
Change from 2016
-0.1pp
795
5.2%
-0.1pp
60 to 64
2021 count
797
% of total
5.2%
Change from 2016
+0.1pp
797
5.2%
+0.1pp
65 to 69
2021 count
723
% of total
4.7%
Change from 2016
+0.4pp
723
4.7%
+0.4pp
70 to 74
2021 count
614
% of total
4.0%
Change from 2016
+1.3pp
614
4.0%
+1.3pp
75 to 79
2021 count
386
% of total
2.5%
Change from 2016
+0.2pp
386
2.5%
+0.2pp
80 to 84
2021 count
320
% of total
2.1%
Change from 2016
+0.6pp
320
2.1%
+0.6pp
85 and over
2021 count
366
% of total
2.4%
Change from 2016
+0.3pp
366
2.4%
+0.3pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-40
-0.2pp
5 to 9
+25
+0.2pp
10 to 14
+129
+0.8pp
15 to 19
-83
-0.5pp
20 to 24
-346
-2.2pp
25 to 29
-286
-1.8pp
30 to 34
-53
-0.3pp
35 to 39
+86
+0.5pp
40 to 44
+170
+1.1pp
45 to 49
+4
0.0pp
50 to 54
+25
+0.2pp
55 to 59
-19
-0.1pp
60 to 64
+21
+0.1pp
65 to 69
+62
+0.4pp
70 to 74
+196
+1.3pp
75 to 79
+31
+0.2pp
80 to 84
+85
+0.6pp
85 and over
+49
+0.3pp
Data table
Five year age groups for Eight Mile Plains. 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 | 901 | 5.9% | 5.5% | 941 | 6.1% | 6.0% | -40 | -0.2pp |
| 5 to 9 | 946 | 6.2% | 6.0% | 921 | 6.0% | 6.0% | +25 | +0.2pp |
| 10 to 14 | 843 | 5.5% | 6.0% | 714 | 4.7% | 5.6% | +129 | +0.8pp |
| 15 to 19 | 774 | 5.1% | 6.0% | 857 | 5.6% | 6.2% | -83 | -0.5pp |
| 20 to 24 | 1,145 | 7.5% | 7.8% | 1,491 | 9.7% | 8.7% | -346 | -2.2pp |
| 25 to 29 | 1,284 | 8.4% | 8.4% | 1,570 | 10.2% | 8.8% | -286 | -1.8pp |
| 30 to 34 | 1,362 | 8.9% | 8.3% | 1,415 | 9.2% | 8.5% | -53 | -0.3pp |
| 35 to 39 | 1,263 | 8.2% | 8.1% | 1,177 | 7.7% | 7.4% | +86 | +0.5pp |
| 40 to 44 | 1,102 | 7.2% | 7.1% | 932 | 6.1% | 7.3% | +170 | +1.1pp |
| 45 to 49 | 893 | 5.8% | 6.8% | 889 | 5.8% | 6.9% | +4 | 0.0pp |
| 50 to 54 | 852 | 5.6% | 6.3% | 827 | 5.4% | 6.1% | +25 | +0.2pp |
| 55 to 59 | 795 | 5.2% | 5.5% | 814 | 5.3% | 5.4% | -19 | -0.1pp |
| 60 to 64 | 797 | 5.2% | 4.8% | 776 | 5.1% | 4.6% | +21 | +0.1pp |
| 65 to 69 | 723 | 4.7% | 4.0% | 661 | 4.3% | 4.0% | +62 | +0.4pp |
| 70 to 74 | 614 | 4.0% | 3.5% | 418 | 2.7% | 2.9% | +196 | +1.3pp |
| 75 to 79 | 386 | 2.5% | 2.5% | 355 | 2.3% | 2.2% | +31 | +0.2pp |
| 80 to 84 | 320 | 2.1% | 1.7% | 235 | 1.5% | 1.6% | +85 | +0.6pp |
| 85 and over | 366 | 2.4% | 1.8% | 317 | 2.1% | 1.8% | +49 | +0.3pp |
| Total | 15,326 | 100.0% | 100.0% | 15,322 | 100.0% | 100.0% | +4 | 0.0pp |