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 Bayside (NSW), accounting for 10.5% (18,362 people). This share was higher than Greater Sydney (8%).
Section overview
Age structure - Five year age groups
Bayside (NSW) - Total persons (Usual residence)
This table summarises five year age groups for Bayside (NSW) in 2021 for persons, with comparison against Greater Sydney and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Bayside (NSW), with comparison markers for Greater Sydney.
0 to 4
2021 count
9,984
% of total
5.7%
Change from 2016
-
9,984
5.7%
-
5 to 9
2021 count
8,544
% of total
4.9%
Change from 2016
-
8,544
4.9%
-
10 to 14
2021 count
7,949
% of total
4.5%
Change from 2016
-
7,949
4.5%
-
15 to 19
2021 count
7,775
% of total
4.4%
Change from 2016
-
7,775
4.4%
-
20 to 24
2021 count
13,717
% of total
7.8%
Change from 2016
-
13,717
7.8%
-
25 to 29
2021 count
18,167
% of total
10.4%
Change from 2016
-
18,167
10.4%
-
30 to 34
2021 count
18,362
% of total
10.5%
Change from 2016
-
18,362
10.5%
-
35 to 39
2021 count
14,997
% of total
8.6%
Change from 2016
-
14,997
8.6%
-
40 to 44
2021 count
11,556
% of total
6.6%
Change from 2016
-
11,556
6.6%
-
45 to 49
2021 count
10,745
% of total
6.1%
Change from 2016
-
10,745
6.1%
-
50 to 54
2021 count
9,885
% of total
5.6%
Change from 2016
-
9,885
5.6%
-
55 to 59
2021 count
9,350
% of total
5.3%
Change from 2016
-
9,350
5.3%
-
60 to 64
2021 count
8,138
% of total
4.6%
Change from 2016
-
8,138
4.6%
-
65 to 69
2021 count
7,084
% of total
4.0%
Change from 2016
-
7,084
4.0%
-
70 to 74
2021 count
6,397
% of total
3.7%
Change from 2016
-
6,397
3.7%
-
75 to 79
2021 count
4,876
% of total
2.8%
Change from 2016
-
4,876
2.8%
-
80 to 84
2021 count
3,834
% of total
2.2%
Change from 2016
-
3,834
2.2%
-
85 and over
2021 count
3,802
% of total
2.2%
Change from 2016
-
3,802
2.2%
-
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
Data table
Five year age groups for Bayside (NSW). Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Greater Sydney.
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Greater Sydney% | Count | % | Greater Sydney% | Count | pp | |
| 0 to 4 | 9,984 | 5.7% | 6.0% | - | - | 6.4% | - | - |
| 5 to 9 | 8,544 | 4.9% | 6.3% | - | - | 6.4% | - | - |
| 10 to 14 | 7,949 | 4.5% | 6.2% | - | - | 5.8% | - | - |
| 15 to 19 | 7,775 | 4.4% | 5.6% | - | - | 6.0% | - | - |
| 20 to 24 | 13,717 | 7.8% | 6.6% | - | - | 7.1% | - | - |
| 25 to 29 | 18,167 | 10.4% | 7.5% | - | - | 7.9% | - | - |
| 30 to 34 | 18,362 | 10.5% | 8.0% | - | - | 8.1% | - | - |
| 35 to 39 | 14,997 | 8.6% | 7.9% | - | - | 7.4% | - | - |
| 40 to 44 | 11,556 | 6.6% | 7.0% | - | - | 7.1% | - | - |
| 45 to 49 | 10,745 | 6.1% | 6.6% | - | - | 6.7% | - | - |
| 50 to 54 | 9,885 | 5.6% | 6.2% | - | - | 6.3% | - | - |
| 55 to 59 | 9,350 | 5.3% | 5.8% | - | - | 5.8% | - | - |
| 60 to 64 | 8,138 | 4.6% | 5.3% | - | - | 5.0% | - | - |
| 65 to 69 | 7,084 | 4.0% | 4.5% | - | - | 4.4% | - | - |
| 70 to 74 | 6,397 | 3.7% | 3.9% | - | - | 3.3% | - | - |
| 75 to 79 | 4,876 | 2.8% | 2.8% | - | - | 2.4% | - | - |
| 80 to 84 | 3,834 | 2.2% | 2.0% | - | - | 1.8% | - | - |
| 85 and over | 3,802 | 2.2% | 2.0% | - | - | 2.0% | - | - |
| Total | 175,184 | 100.0% | 100.0% | - | - | 100.0% | - | - |