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, 5 to 9 year olds was the largest age group among residents in Castlereagh, accounting for 8% (100 people). This share was higher than Penrith (C) (7.2%). Since 2016, the biggest change was in 50 to 54 year olds, which decreased by 35 people and 3.3 percentage points.
Section overview
Age structure - Five year age groups
Castlereagh - Total persons (Usual residence)
This table summarises five year age groups for Castlereagh in 2021 for persons, with comparison against Penrith (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Castlereagh, with comparison markers for Penrith (C).
0 to 4
2021 count
82
% of total
6.6%
Change from 2016
+1.0pp
82
6.6%
+1.0pp
5 to 9
2021 count
100
% of total
8.0%
Change from 2016
+2.1pp
100
8.0%
+2.1pp
10 to 14
2021 count
83
% of total
6.7%
Change from 2016
-0.1pp
83
6.7%
-0.1pp
15 to 19
2021 count
82
% of total
6.6%
Change from 2016
+0.4pp
82
6.6%
+0.4pp
20 to 24
2021 count
58
% of total
4.6%
Change from 2016
-2.4pp
58
4.6%
-2.4pp
25 to 29
2021 count
68
% of total
5.4%
Change from 2016
-1.3pp
68
5.4%
-1.3pp
30 to 34
2021 count
77
% of total
6.2%
Change from 2016
+2.4pp
77
6.2%
+2.4pp
35 to 39
2021 count
87
% of total
7.0%
Change from 2016
+1.3pp
87
7.0%
+1.3pp
40 to 44
2021 count
77
% of total
6.2%
Change from 2016
0.0pp
77
6.2%
0.0pp
45 to 49
2021 count
72
% of total
5.8%
Change from 2016
+0.7pp
72
5.8%
+0.7pp
50 to 54
2021 count
60
% of total
4.8%
Change from 2016
-3.3pp
60
4.8%
-3.3pp
55 to 59
2021 count
73
% of total
5.8%
Change from 2016
-1.5pp
73
5.8%
-1.5pp
60 to 64
2021 count
78
% of total
6.3%
Change from 2016
-1.3pp
78
6.3%
-1.3pp
65 to 69
2021 count
93
% of total
7.5%
Change from 2016
+1.3pp
93
7.5%
+1.3pp
70 to 74
2021 count
57
% of total
4.6%
Change from 2016
+1.2pp
57
4.6%
+1.2pp
75 to 79
2021 count
33
% of total
2.6%
Change from 2016
-0.1pp
33
2.6%
-0.1pp
80 to 84
2021 count
25
% of total
2.0%
Change from 2016
0.0pp
25
2.0%
0.0pp
85 and over
2021 count
17
% of total
1.4%
Change from 2016
+0.6pp
17
1.4%
+0.6pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+17
+1.0pp
5 to 9
+31
+2.1pp
10 to 14
+3
-0.1pp
15 to 19
+9
+0.4pp
20 to 24
-24
-2.4pp
25 to 29
-11
-1.3pp
30 to 34
+33
+2.4pp
35 to 39
+20
+1.3pp
40 to 44
+4
0.0pp
45 to 49
+12
+0.7pp
50 to 54
-35
-3.3pp
55 to 59
-13
-1.5pp
60 to 64
-11
-1.3pp
65 to 69
+20
+1.3pp
70 to 74
+17
+1.2pp
75 to 79
+1
-0.1pp
80 to 84
+2
0.0pp
85 and over
+8
+0.6pp
Data table
Five year age groups for Castlereagh. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Penrith (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Penrith (C)% | Count | % | Penrith (C)% | Count | pp | |
| 0 to 4 | 82 | 6.6% | 7.2% | 65 | 5.6% | 7.4% | +17 | +1.0pp |
| 5 to 9 | 100 | 8.0% | 7.2% | 69 | 5.9% | 7.2% | +31 | +2.1pp |
| 10 to 14 | 83 | 6.7% | 6.8% | 80 | 6.8% | 6.5% | +3 | -0.1pp |
| 15 to 19 | 82 | 6.6% | 6.2% | 73 | 6.2% | 6.6% | +9 | +0.4pp |
| 20 to 24 | 58 | 4.6% | 6.8% | 82 | 7.0% | 7.2% | -24 | -2.4pp |
| 25 to 29 | 68 | 5.4% | 7.4% | 79 | 6.7% | 7.7% | -11 | -1.3pp |
| 30 to 34 | 77 | 6.2% | 7.7% | 44 | 3.8% | 7.8% | +33 | +2.4pp |
| 35 to 39 | 87 | 7.0% | 7.8% | 67 | 5.7% | 7.1% | +20 | +1.3pp |
| 40 to 44 | 77 | 6.2% | 6.8% | 73 | 6.2% | 6.9% | +4 | 0.0pp |
| 45 to 49 | 72 | 5.8% | 6.4% | 60 | 5.1% | 6.4% | +12 | +0.7pp |
| 50 to 54 | 60 | 4.8% | 5.9% | 95 | 8.1% | 6.2% | -35 | -3.3pp |
| 55 to 59 | 73 | 5.8% | 5.5% | 86 | 7.3% | 6.1% | -13 | -1.5pp |
| 60 to 64 | 78 | 6.3% | 5.2% | 89 | 7.6% | 5.2% | -11 | -1.3pp |
| 65 to 69 | 93 | 7.5% | 4.3% | 73 | 6.2% | 4.5% | +20 | +1.3pp |
| 70 to 74 | 57 | 4.6% | 3.7% | 40 | 3.4% | 2.9% | +17 | +1.2pp |
| 75 to 79 | 33 | 2.6% | 2.3% | 32 | 2.7% | 1.9% | +1 | -0.1pp |
| 80 to 84 | 25 | 2.0% | 1.4% | 23 | 2.0% | 1.2% | +2 | 0.0pp |
| 85 and over | 17 | 1.4% | 1.2% | 9 | 0.8% | 1.2% | +8 | +0.6pp |
| Total | 1,248 | 100.0% | 100.0% | 1,171 | 100.0% | 100.0% | +77 | 0.0pp |