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 Castle Cove, accounting for 8.7% (230 people). This share was higher than Willoughby (C) (6.8%). Since 2016, the biggest change was in 0 to 4 year olds, which decreased by 47 people and 2 percentage points.
Section overview
Age structure - Five year age groups
Castle Cove - Total persons (Usual residence)
This table summarises five year age groups for Castle Cove 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 Castle Cove, with comparison markers for Willoughby (C).
0 to 4
2021 count
96
% of total
3.6%
Change from 2016
-2.0pp
96
3.6%
-2.0pp
5 to 9
2021 count
203
% of total
7.7%
Change from 2016
+0.1pp
203
7.7%
+0.1pp
10 to 14
2021 count
230
% of total
8.7%
Change from 2016
+1.1pp
230
8.7%
+1.1pp
15 to 19
2021 count
194
% of total
7.3%
Change from 2016
+1.2pp
194
7.3%
+1.2pp
20 to 24
2021 count
139
% of total
5.3%
Change from 2016
+0.1pp
139
5.3%
+0.1pp
25 to 29
2021 count
76
% of total
2.9%
Change from 2016
-0.4pp
76
2.9%
-0.4pp
30 to 34
2021 count
52
% of total
2.0%
Change from 2016
-1.1pp
52
2.0%
-1.1pp
35 to 39
2021 count
110
% of total
4.2%
Change from 2016
+0.4pp
110
4.2%
+0.4pp
40 to 44
2021 count
182
% of total
6.9%
Change from 2016
-0.8pp
182
6.9%
-0.8pp
45 to 49
2021 count
204
% of total
7.7%
Change from 2016
-0.1pp
204
7.7%
-0.1pp
50 to 54
2021 count
205
% of total
7.8%
Change from 2016
-0.5pp
205
7.8%
-0.5pp
55 to 59
2021 count
196
% of total
7.4%
Change from 2016
+0.7pp
196
7.4%
+0.7pp
60 to 64
2021 count
166
% of total
6.3%
Change from 2016
-0.2pp
166
6.3%
-0.2pp
65 to 69
2021 count
149
% of total
5.6%
Change from 2016
+0.4pp
149
5.6%
+0.4pp
70 to 74
2021 count
135
% of total
5.1%
Change from 2016
+0.9pp
135
5.1%
+0.9pp
75 to 79
2021 count
116
% of total
4.4%
Change from 2016
+0.6pp
116
4.4%
+0.6pp
80 to 84
2021 count
94
% of total
3.6%
Change from 2016
+0.2pp
94
3.6%
+0.2pp
85 and over
2021 count
99
% of total
3.7%
Change from 2016
0.0pp
99
3.7%
0.0pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-47
-2.0pp
5 to 9
+10
+0.1pp
10 to 14
+37
+1.1pp
15 to 19
+38
+1.2pp
20 to 24
+6
+0.1pp
25 to 29
-8
-0.4pp
30 to 34
-28
-1.1pp
35 to 39
+12
+0.4pp
40 to 44
-15
-0.8pp
45 to 49
+5
-0.1pp
50 to 54
-8
-0.5pp
55 to 59
+25
+0.7pp
60 to 64
-1
-0.2pp
65 to 69
+15
+0.4pp
70 to 74
+28
+0.9pp
75 to 79
+20
+0.6pp
80 to 84
+6
+0.2pp
85 and over
+5
0.0pp
Data table
Five year age groups for Castle Cove. 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 | 96 | 3.6% | 5.2% | 143 | 5.6% | 6.6% | -47 | -2.0pp |
| 5 to 9 | 203 | 7.7% | 6.8% | 193 | 7.6% | 7.0% | +10 | +0.1pp |
| 10 to 14 | 230 | 8.7% | 6.8% | 193 | 7.6% | 5.8% | +37 | +1.1pp |
| 15 to 19 | 194 | 7.3% | 5.5% | 156 | 6.1% | 5.4% | +38 | +1.2pp |
| 20 to 24 | 139 | 5.3% | 5.2% | 133 | 5.2% | 6.0% | +6 | +0.1pp |
| 25 to 29 | 76 | 2.9% | 5.8% | 84 | 3.3% | 6.9% | -8 | -0.4pp |
| 30 to 34 | 52 | 2.0% | 6.6% | 80 | 3.1% | 8.3% | -28 | -1.1pp |
| 35 to 39 | 110 | 4.2% | 8.4% | 98 | 3.8% | 8.6% | +12 | +0.4pp |
| 40 to 44 | 182 | 6.9% | 8.4% | 197 | 7.7% | 8.1% | -15 | -0.8pp |
| 45 to 49 | 204 | 7.7% | 7.7% | 199 | 7.8% | 7.2% | +5 | -0.1pp |
| 50 to 54 | 205 | 7.8% | 6.6% | 213 | 8.3% | 6.3% | -8 | -0.5pp |
| 55 to 59 | 196 | 7.4% | 5.8% | 171 | 6.7% | 5.4% | +25 | +0.7pp |
| 60 to 64 | 166 | 6.3% | 5.0% | 167 | 6.5% | 4.8% | -1 | -0.2pp |
| 65 to 69 | 149 | 5.6% | 4.5% | 134 | 5.2% | 4.4% | +15 | +0.4pp |
| 70 to 74 | 135 | 5.1% | 4.1% | 107 | 4.2% | 2.9% | +28 | +0.9pp |
| 75 to 79 | 116 | 4.4% | 2.8% | 96 | 3.8% | 2.2% | +20 | +0.6pp |
| 80 to 84 | 94 | 3.6% | 2.0% | 88 | 3.4% | 1.8% | +6 | +0.2pp |
| 85 and over | 99 | 3.7% | 2.6% | 94 | 3.7% | 2.3% | +5 | 0.0pp |
| Total | 2,643 | 100.0% | 100.0% | 2,554 | 100.0% | 100.0% | +89 | 0.0pp |