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, 45 to 49 year olds was the largest age group among residents in Middle Cove, accounting for 8.7% (116 people). This share was higher than Willoughby (C) (7.7%). Since 2016, the biggest change was in 5 to 9 year olds, which decreased by 21 people and 1.5 percentage points.
Section overview
Age structure - Five year age groups
Middle Cove - Total persons (Usual residence)
This table summarises five year age groups for Middle 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 Middle Cove, with comparison markers for Willoughby (C).
0 to 4
2021 count
51
% of total
3.8%
Change from 2016
-0.6pp
51
3.8%
-0.6pp
5 to 9
2021 count
93
% of total
7.0%
Change from 2016
-1.5pp
93
7.0%
-1.5pp
10 to 14
2021 count
114
% of total
8.6%
Change from 2016
+0.2pp
114
8.6%
+0.2pp
15 to 19
2021 count
93
% of total
7.0%
Change from 2016
-1.1pp
93
7.0%
-1.1pp
20 to 24
2021 count
82
% of total
6.2%
Change from 2016
+1.5pp
82
6.2%
+1.5pp
25 to 29
2021 count
34
% of total
2.6%
Change from 2016
+1.0pp
34
2.6%
+1.0pp
30 to 34
2021 count
19
% of total
1.4%
Change from 2016
-1.6pp
19
1.4%
-1.6pp
35 to 39
2021 count
46
% of total
3.5%
Change from 2016
-1.4pp
46
3.5%
-1.4pp
40 to 44
2021 count
92
% of total
6.9%
Change from 2016
-0.7pp
92
6.9%
-0.7pp
45 to 49
2021 count
116
% of total
8.7%
Change from 2016
+0.1pp
116
8.7%
+0.1pp
50 to 54
2021 count
107
% of total
8.1%
Change from 2016
-0.8pp
107
8.1%
-0.8pp
55 to 59
2021 count
106
% of total
8.0%
Change from 2016
-0.4pp
106
8.0%
-0.4pp
60 to 64
2021 count
104
% of total
7.8%
Change from 2016
+1.5pp
104
7.8%
+1.5pp
65 to 69
2021 count
67
% of total
5.0%
Change from 2016
+0.9pp
67
5.0%
+0.9pp
70 to 74
2021 count
62
% of total
4.7%
Change from 2016
+0.7pp
62
4.7%
+0.7pp
75 to 79
2021 count
50
% of total
3.8%
Change from 2016
+1.2pp
50
3.8%
+1.2pp
80 to 84
2021 count
29
% of total
2.2%
Change from 2016
-0.4pp
29
2.2%
-0.4pp
85 and over
2021 count
40
% of total
3.0%
Change from 2016
-0.1pp
40
3.0%
-0.1pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-8
-0.6pp
5 to 9
-21
-1.5pp
10 to 14
+1
+0.2pp
15 to 19
-15
-1.1pp
20 to 24
+19
+1.5pp
25 to 29
+12
+1.0pp
30 to 34
-21
-1.6pp
35 to 39
-20
-1.4pp
40 to 44
-10
-0.7pp
45 to 49
+1
+0.1pp
50 to 54
-12
-0.8pp
55 to 59
-7
-0.4pp
60 to 64
+20
+1.5pp
65 to 69
+12
+0.9pp
70 to 74
+9
+0.7pp
75 to 79
+15
+1.2pp
80 to 84
-6
-0.4pp
85 and over
-1
-0.1pp
Data table
Five year age groups for Middle 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 | 51 | 3.8% | 5.2% | 59 | 4.4% | 6.6% | -8 | -0.6pp |
| 5 to 9 | 93 | 7.0% | 6.8% | 114 | 8.5% | 7.0% | -21 | -1.5pp |
| 10 to 14 | 114 | 8.6% | 6.8% | 113 | 8.4% | 5.8% | +1 | +0.2pp |
| 15 to 19 | 93 | 7.0% | 5.5% | 108 | 8.1% | 5.4% | -15 | -1.1pp |
| 20 to 24 | 82 | 6.2% | 5.2% | 63 | 4.7% | 6.0% | +19 | +1.5pp |
| 25 to 29 | 34 | 2.6% | 5.8% | 22 | 1.6% | 6.9% | +12 | +1.0pp |
| 30 to 34 | 19 | 1.4% | 6.6% | 40 | 3.0% | 8.3% | -21 | -1.6pp |
| 35 to 39 | 46 | 3.5% | 8.4% | 66 | 4.9% | 8.6% | -20 | -1.4pp |
| 40 to 44 | 92 | 6.9% | 8.4% | 102 | 7.6% | 8.1% | -10 | -0.7pp |
| 45 to 49 | 116 | 8.7% | 7.7% | 115 | 8.6% | 7.2% | +1 | +0.1pp |
| 50 to 54 | 107 | 8.1% | 6.6% | 119 | 8.9% | 6.3% | -12 | -0.8pp |
| 55 to 59 | 106 | 8.0% | 5.8% | 113 | 8.4% | 5.4% | -7 | -0.4pp |
| 60 to 64 | 104 | 7.8% | 5.0% | 84 | 6.3% | 4.8% | +20 | +1.5pp |
| 65 to 69 | 67 | 5.0% | 4.5% | 55 | 4.1% | 4.4% | +12 | +0.9pp |
| 70 to 74 | 62 | 4.7% | 4.1% | 53 | 4.0% | 2.9% | +9 | +0.7pp |
| 75 to 79 | 50 | 3.8% | 2.8% | 35 | 2.6% | 2.2% | +15 | +1.2pp |
| 80 to 84 | 29 | 2.2% | 2.0% | 35 | 2.6% | 1.8% | -6 | -0.4pp |
| 85 and over | 40 | 3.0% | 2.6% | 41 | 3.1% | 2.3% | -1 | -0.1pp |
| Total | 1,327 | 100.0% | 100.0% | 1,340 | 100.0% | 100.0% | -13 | 0.0pp |