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, 50 to 54 year olds was the largest age group among residents in Birkdale, accounting for 7% (1,032 people). This share was similar to Redland (C) (6.9%). Since 2016, the biggest change was in 70 to 74 year olds, which increased by 232 people and 1.4 percentage points.
Section overview
Age structure - Five year age groups
Birkdale - Total persons (Usual residence)
This table summarises five year age groups for Birkdale 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 Birkdale, with comparison markers for Redland (C).
0 to 4
2021 count
748
% of total
5.0%
Change from 2016
-0.7pp
748
5.0%
-0.7pp
5 to 9
2021 count
918
% of total
6.2%
Change from 2016
-0.4pp
918
6.2%
-0.4pp
10 to 14
2021 count
980
% of total
6.6%
Change from 2016
+0.2pp
980
6.6%
+0.2pp
15 to 19
2021 count
924
% of total
6.2%
Change from 2016
-0.3pp
924
6.2%
-0.3pp
20 to 24
2021 count
778
% of total
5.3%
Change from 2016
-0.8pp
778
5.3%
-0.8pp
25 to 29
2021 count
718
% of total
4.8%
Change from 2016
-0.4pp
718
4.8%
-0.4pp
30 to 34
2021 count
782
% of total
5.3%
Change from 2016
-0.4pp
782
5.3%
-0.4pp
35 to 39
2021 count
942
% of total
6.4%
Change from 2016
+0.4pp
942
6.4%
+0.4pp
40 to 44
2021 count
895
% of total
6.0%
Change from 2016
-1.0pp
895
6.0%
-1.0pp
45 to 49
2021 count
995
% of total
6.7%
Change from 2016
-0.5pp
995
6.7%
-0.5pp
50 to 54
2021 count
1,032
% of total
7.0%
Change from 2016
0.0pp
1,032
7.0%
0.0pp
55 to 59
2021 count
959
% of total
6.5%
Change from 2016
0.0pp
959
6.5%
0.0pp
60 to 64
2021 count
911
% of total
6.1%
Change from 2016
-0.2pp
911
6.1%
-0.2pp
65 to 69
2021 count
913
% of total
6.2%
Change from 2016
+0.5pp
913
6.2%
+0.5pp
70 to 74
2021 count
849
% of total
5.7%
Change from 2016
+1.4pp
849
5.7%
+1.4pp
75 to 79
2021 count
637
% of total
4.3%
Change from 2016
+1.3pp
637
4.3%
+1.3pp
80 to 84
2021 count
404
% of total
2.7%
Change from 2016
+0.6pp
404
2.7%
+0.6pp
85 and over
2021 count
434
% of total
2.9%
Change from 2016
0.0pp
434
2.9%
0.0pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-80
-0.7pp
5 to 9
-46
-0.4pp
10 to 14
+55
+0.2pp
15 to 19
-15
-0.3pp
20 to 24
-100
-0.8pp
25 to 29
-31
-0.4pp
30 to 34
-42
-0.4pp
35 to 39
+73
+0.4pp
40 to 44
-116
-1.0pp
45 to 49
-56
-0.5pp
50 to 54
+21
0.0pp
55 to 59
+11
0.0pp
60 to 64
-8
-0.2pp
65 to 69
+83
+0.5pp
70 to 74
+232
+1.4pp
75 to 79
+198
+1.3pp
80 to 84
+106
+0.6pp
85 and over
+20
0.0pp
Data table
Five year age groups for Birkdale. 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 | 748 | 5.0% | 5.1% | 828 | 5.7% | 5.5% | -80 | -0.7pp |
| 5 to 9 | 918 | 6.2% | 5.9% | 964 | 6.6% | 6.6% | -46 | -0.4pp |
| 10 to 14 | 980 | 6.6% | 6.8% | 925 | 6.4% | 6.7% | +55 | +0.2pp |
| 15 to 19 | 924 | 6.2% | 6.3% | 939 | 6.5% | 6.6% | -15 | -0.3pp |
| 20 to 24 | 778 | 5.3% | 5.1% | 878 | 6.1% | 5.6% | -100 | -0.8pp |
| 25 to 29 | 718 | 4.8% | 4.7% | 749 | 5.2% | 5.0% | -31 | -0.4pp |
| 30 to 34 | 782 | 5.3% | 5.4% | 824 | 5.7% | 5.7% | -42 | -0.4pp |
| 35 to 39 | 942 | 6.4% | 6.2% | 869 | 6.0% | 5.8% | +73 | +0.4pp |
| 40 to 44 | 895 | 6.0% | 6.1% | 1,011 | 7.0% | 6.8% | -116 | -1.0pp |
| 45 to 49 | 995 | 6.7% | 6.8% | 1,051 | 7.2% | 7.1% | -56 | -0.5pp |
| 50 to 54 | 1,032 | 7.0% | 6.9% | 1,011 | 7.0% | 7.3% | +21 | 0.0pp |
| 55 to 59 | 959 | 6.5% | 6.9% | 948 | 6.5% | 7.1% | +11 | 0.0pp |
| 60 to 64 | 911 | 6.1% | 6.8% | 919 | 6.3% | 6.4% | -8 | -0.2pp |
| 65 to 69 | 913 | 6.2% | 6.2% | 830 | 5.7% | 6.0% | +83 | +0.5pp |
| 70 to 74 | 849 | 5.7% | 5.7% | 617 | 4.3% | 4.5% | +232 | +1.4pp |
| 75 to 79 | 637 | 4.3% | 4.1% | 439 | 3.0% | 3.1% | +198 | +1.3pp |
| 80 to 84 | 404 | 2.7% | 2.5% | 298 | 2.1% | 2.1% | +106 | +0.6pp |
| 85 and over | 434 | 2.9% | 2.4% | 414 | 2.9% | 2.2% | +20 | 0.0pp |
| Total | 14,816 | 100.0% | 100.0% | 14,497 | 100.0% | 100.0% | +319 | 0.0pp |