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, 10 to 14 year olds was the largest age group among residents in Willoughby East, accounting for 10.3% (192 people). This share was higher than Willoughby (C) (6.8%). Since 2016, the biggest change was in 35 to 39 year olds, which decreased by 42 people and 2.4 percentage points.
Section overview
Age structure - Five year age groups
Willoughby East - Total persons (Usual residence)
This table summarises five year age groups for Willoughby East in 2021 for persons, with comparison against Willoughby (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Willoughby East, with comparison markers for Willoughby (C).
0 to 4
2021 count
102
% of total
5.5%
Change from 2016
-1.6pp
102
5.5%
-1.6pp
5 to 9
2021 count
168
% of total
9.0%
Change from 2016
-1.4pp
168
9.0%
-1.4pp
10 to 14
2021 count
192
% of total
10.3%
Change from 2016
+0.8pp
192
10.3%
+0.8pp
15 to 19
2021 count
143
% of total
7.7%
Change from 2016
+1.6pp
143
7.7%
+1.6pp
20 to 24
2021 count
79
% of total
4.2%
Change from 2016
-0.7pp
79
4.2%
-0.7pp
25 to 29
2021 count
44
% of total
2.4%
Change from 2016
-0.1pp
44
2.4%
-0.1pp
30 to 34
2021 count
44
% of total
2.4%
Change from 2016
-0.1pp
44
2.4%
-0.1pp
35 to 39
2021 count
85
% of total
4.6%
Change from 2016
-2.4pp
85
4.6%
-2.4pp
40 to 44
2021 count
169
% of total
9.1%
Change from 2016
-0.3pp
169
9.1%
-0.3pp
45 to 49
2021 count
168
% of total
9.0%
Change from 2016
-0.3pp
168
9.0%
-0.3pp
50 to 54
2021 count
158
% of total
8.5%
Change from 2016
+1.6pp
158
8.5%
+1.6pp
55 to 59
2021 count
105
% of total
5.6%
Change from 2016
-1.0pp
105
5.6%
-1.0pp
60 to 64
2021 count
97
% of total
5.2%
Change from 2016
0.0pp
97
5.2%
0.0pp
65 to 69
2021 count
88
% of total
4.7%
Change from 2016
+0.8pp
88
4.7%
+0.8pp
70 to 74
2021 count
74
% of total
4.0%
Change from 2016
+1.5pp
74
4.0%
+1.5pp
75 to 79
2021 count
50
% of total
2.7%
Change from 2016
+0.1pp
50
2.7%
+0.1pp
80 to 84
2021 count
29
% of total
1.6%
Change from 2016
0.0pp
29
1.6%
0.0pp
85 and over
2021 count
37
% of total
2.0%
Change from 2016
+1.3pp
37
2.0%
+1.3pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-27
-1.6pp
5 to 9
-21
-1.4pp
10 to 14
+18
+0.8pp
15 to 19
+31
+1.6pp
20 to 24
-11
-0.7pp
25 to 29
-1
-0.1pp
30 to 34
-2
-0.1pp
35 to 39
-42
-2.4pp
40 to 44
-3
-0.3pp
45 to 49
-1
-0.3pp
50 to 54
+33
+1.6pp
55 to 59
-15
-1.0pp
60 to 64
+3
0.0pp
65 to 69
+17
+0.8pp
70 to 74
+29
+1.5pp
75 to 79
+3
+0.1pp
80 to 84
0
0.0pp
85 and over
+24
+1.3pp
Data table
Five year age groups for Willoughby East. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Willoughby (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Willoughby (C)% | Count | % | Willoughby (C)% | Count | pp | |
| 0 to 4 | 102 | 5.5% | 5.2% | 129 | 7.1% | 6.6% | -27 | -1.6pp |
| 5 to 9 | 168 | 9.0% | 6.8% | 189 | 10.4% | 7.0% | -21 | -1.4pp |
| 10 to 14 | 192 | 10.3% | 6.8% | 174 | 9.5% | 5.8% | +18 | +0.8pp |
| 15 to 19 | 143 | 7.7% | 5.5% | 112 | 6.1% | 5.4% | +31 | +1.6pp |
| 20 to 24 | 79 | 4.2% | 5.2% | 90 | 4.9% | 6.0% | -11 | -0.7pp |
| 25 to 29 | 44 | 2.4% | 5.8% | 45 | 2.5% | 6.9% | -1 | -0.1pp |
| 30 to 34 | 44 | 2.4% | 6.6% | 46 | 2.5% | 8.3% | -2 | -0.1pp |
| 35 to 39 | 85 | 4.6% | 8.4% | 127 | 7.0% | 8.6% | -42 | -2.4pp |
| 40 to 44 | 169 | 9.1% | 8.4% | 172 | 9.4% | 8.1% | -3 | -0.3pp |
| 45 to 49 | 168 | 9.0% | 7.7% | 169 | 9.3% | 7.2% | -1 | -0.3pp |
| 50 to 54 | 158 | 8.5% | 6.6% | 125 | 6.9% | 6.3% | +33 | +1.6pp |
| 55 to 59 | 105 | 5.6% | 5.8% | 120 | 6.6% | 5.4% | -15 | -1.0pp |
| 60 to 64 | 97 | 5.2% | 5.0% | 94 | 5.2% | 4.8% | +3 | 0.0pp |
| 65 to 69 | 88 | 4.7% | 4.5% | 71 | 3.9% | 4.4% | +17 | +0.8pp |
| 70 to 74 | 74 | 4.0% | 4.1% | 45 | 2.5% | 2.9% | +29 | +1.5pp |
| 75 to 79 | 50 | 2.7% | 2.8% | 47 | 2.6% | 2.2% | +3 | +0.1pp |
| 80 to 84 | 29 | 1.6% | 2.0% | 29 | 1.6% | 1.8% | 0 | 0.0pp |
| 85 and over | 37 | 2.0% | 2.6% | 13 | 0.7% | 2.3% | +24 | +1.3pp |
| Total | 1,864 | 100.0% | 100.0% | 1,822 | 100.0% | 100.0% | +42 | 0.0pp |