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 O'Halloran Hill (part), accounting for 8.1% (221 people). This share was higher than Onkaparinga (C) (6.3%). Since 2016, the biggest change was in 75 to 79 year olds, which increased by 72 people and 2.6 percentage points.
Section overview
Age structure - Five year age groups
O'Halloran Hill (part) - Total persons (Usual residence)
This table summarises five year age groups for O'Halloran Hill (part) in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for O'Halloran Hill (part), with comparison markers for Onkaparinga (C).
0 to 4
2021 count
144
% of total
5.3%
Change from 2016
-2.1pp
144
5.3%
-2.1pp
5 to 9
2021 count
160
% of total
5.9%
Change from 2016
0.0pp
160
5.9%
0.0pp
10 to 14
2021 count
172
% of total
6.3%
Change from 2016
+1.3pp
172
6.3%
+1.3pp
15 to 19
2021 count
125
% of total
4.6%
Change from 2016
-1.2pp
125
4.6%
-1.2pp
20 to 24
2021 count
140
% of total
5.1%
Change from 2016
-0.2pp
140
5.1%
-0.2pp
25 to 29
2021 count
183
% of total
6.7%
Change from 2016
-0.7pp
183
6.7%
-0.7pp
30 to 34
2021 count
221
% of total
8.1%
Change from 2016
+1.9pp
221
8.1%
+1.9pp
35 to 39
2021 count
175
% of total
6.4%
Change from 2016
-1.6pp
175
6.4%
-1.6pp
40 to 44
2021 count
204
% of total
7.5%
Change from 2016
+1.6pp
204
7.5%
+1.6pp
45 to 49
2021 count
151
% of total
5.5%
Change from 2016
-1.6pp
151
5.5%
-1.6pp
50 to 54
2021 count
193
% of total
7.1%
Change from 2016
+1.0pp
193
7.1%
+1.0pp
55 to 59
2021 count
155
% of total
5.7%
Change from 2016
-0.8pp
155
5.7%
-0.8pp
60 to 64
2021 count
152
% of total
5.6%
Change from 2016
-0.6pp
152
5.6%
-0.6pp
65 to 69
2021 count
143
% of total
5.3%
Change from 2016
-1.0pp
143
5.3%
-1.0pp
70 to 74
2021 count
145
% of total
5.3%
Change from 2016
-1.0pp
145
5.3%
-1.0pp
75 to 79
2021 count
138
% of total
5.1%
Change from 2016
+2.6pp
138
5.1%
+2.6pp
80 to 84
2021 count
53
% of total
1.9%
Change from 2016
+0.7pp
53
1.9%
+0.7pp
85 and over
2021 count
24
% of total
0.9%
Change from 2016
+0.2pp
24
0.9%
+0.2pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-54
-2.1pp
5 to 9
+4
0.0pp
10 to 14
+39
+1.3pp
15 to 19
-29
-1.2pp
20 to 24
0
-0.2pp
25 to 29
-15
-0.7pp
30 to 34
+57
+1.9pp
35 to 39
-37
-1.6pp
40 to 44
+46
+1.6pp
45 to 49
-37
-1.6pp
50 to 54
+31
+1.0pp
55 to 59
-17
-0.8pp
60 to 64
-13
-0.6pp
65 to 69
-24
-1.0pp
70 to 74
-22
-1.0pp
75 to 79
+72
+2.6pp
80 to 84
+20
+0.7pp
85 and over
+5
+0.2pp
Data table
Five year age groups for O'Halloran Hill (part). Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Onkaparinga (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Onkaparinga (C)% | Count | % | Onkaparinga (C)% | Count | pp | |
| 0 to 4 | 144 | 5.3% | 5.4% | 198 | 7.4% | 6.2% | -54 | -2.1pp |
| 5 to 9 | 160 | 5.9% | 6.2% | 156 | 5.9% | 6.4% | +4 | 0.0pp |
| 10 to 14 | 172 | 6.3% | 6.2% | 133 | 5.0% | 6.1% | +39 | +1.3pp |
| 15 to 19 | 125 | 4.6% | 5.8% | 154 | 5.8% | 6.2% | -29 | -1.2pp |
| 20 to 24 | 140 | 5.1% | 5.6% | 140 | 5.3% | 6.0% | 0 | -0.2pp |
| 25 to 29 | 183 | 6.7% | 6.0% | 198 | 7.4% | 5.9% | -15 | -0.7pp |
| 30 to 34 | 221 | 8.1% | 6.3% | 164 | 6.2% | 6.5% | +57 | +1.9pp |
| 35 to 39 | 175 | 6.4% | 6.7% | 212 | 8.0% | 6.3% | -37 | -1.6pp |
| 40 to 44 | 204 | 7.5% | 6.1% | 158 | 5.9% | 6.6% | +46 | +1.6pp |
| 45 to 49 | 151 | 5.5% | 6.4% | 188 | 7.1% | 6.9% | -37 | -1.6pp |
| 50 to 54 | 193 | 7.1% | 6.6% | 162 | 6.1% | 6.7% | +31 | +1.0pp |
| 55 to 59 | 155 | 5.7% | 6.5% | 172 | 6.5% | 6.6% | -17 | -0.8pp |
| 60 to 64 | 152 | 5.6% | 6.3% | 165 | 6.2% | 6.3% | -13 | -0.6pp |
| 65 to 69 | 143 | 5.3% | 5.9% | 167 | 6.3% | 6.1% | -24 | -1.0pp |
| 70 to 74 | 145 | 5.3% | 5.7% | 167 | 6.3% | 4.3% | -22 | -1.0pp |
| 75 to 79 | 138 | 5.1% | 3.8% | 66 | 2.5% | 2.8% | +72 | +2.6pp |
| 80 to 84 | 53 | 1.9% | 2.3% | 33 | 1.2% | 2.0% | +20 | +0.7pp |
| 85 and over | 24 | 0.9% | 2.2% | 19 | 0.7% | 2.1% | +5 | +0.2pp |
| Total | 2,722 | 100.0% | 100.0% | 2,658 | 100.0% | 100.0% | +64 | 0.0pp |