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, 50 to 54 year olds was the largest age group among residents in Port Noarlunga, accounting for 7.8% (253 people). This share was higher than Onkaparinga (C) (6.6%). Since 2016, the biggest change was in 25 to 29 year olds, which increased by 79 people and 2.1 percentage points.
Section overview
Age structure - Five year age groups
Port Noarlunga - Total persons (Usual residence)
This table summarises five year age groups for Port Noarlunga 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 Port Noarlunga, with comparison markers for Onkaparinga (C).
0 to 4
2021 count
138
% of total
4.3%
Change from 2016
-0.3pp
138
4.3%
-0.3pp
5 to 9
2021 count
147
% of total
4.5%
Change from 2016
-1.4pp
147
4.5%
-1.4pp
10 to 14
2021 count
197
% of total
6.1%
Change from 2016
+0.3pp
197
6.1%
+0.3pp
15 to 19
2021 count
193
% of total
5.9%
Change from 2016
+0.4pp
193
5.9%
+0.4pp
20 to 24
2021 count
153
% of total
4.7%
Change from 2016
-0.5pp
153
4.7%
-0.5pp
25 to 29
2021 count
203
% of total
6.3%
Change from 2016
+2.1pp
203
6.3%
+2.1pp
30 to 34
2021 count
184
% of total
5.7%
Change from 2016
+0.3pp
184
5.7%
+0.3pp
35 to 39
2021 count
180
% of total
5.5%
Change from 2016
+0.1pp
180
5.5%
+0.1pp
40 to 44
2021 count
183
% of total
5.6%
Change from 2016
-2.2pp
183
5.6%
-2.2pp
45 to 49
2021 count
239
% of total
7.4%
Change from 2016
+0.2pp
239
7.4%
+0.2pp
50 to 54
2021 count
253
% of total
7.8%
Change from 2016
+0.9pp
253
7.8%
+0.9pp
55 to 59
2021 count
228
% of total
7.0%
Change from 2016
-0.4pp
228
7.0%
-0.4pp
60 to 64
2021 count
239
% of total
7.4%
Change from 2016
+0.6pp
239
7.4%
+0.6pp
65 to 69
2021 count
202
% of total
6.2%
Change from 2016
+0.1pp
202
6.2%
+0.1pp
70 to 74
2021 count
177
% of total
5.5%
Change from 2016
+0.7pp
177
5.5%
+0.7pp
75 to 79
2021 count
117
% of total
3.6%
Change from 2016
+0.1pp
117
3.6%
+0.1pp
80 to 84
2021 count
85
% of total
2.6%
Change from 2016
-1.1pp
85
2.6%
-1.1pp
85 and over
2021 count
147
% of total
4.5%
Change from 2016
+0.6pp
147
4.5%
+0.6pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
0
-0.3pp
5 to 9
-29
-1.4pp
10 to 14
+26
+0.3pp
15 to 19
+29
+0.4pp
20 to 24
-2
-0.5pp
25 to 29
+79
+2.1pp
30 to 34
+22
+0.3pp
35 to 39
+20
+0.1pp
40 to 44
-48
-2.2pp
45 to 49
+24
+0.2pp
50 to 54
+48
+0.9pp
55 to 59
+8
-0.4pp
60 to 64
+38
+0.6pp
65 to 69
+21
+0.1pp
70 to 74
+34
+0.7pp
75 to 79
+14
+0.1pp
80 to 84
-24
-1.1pp
85 and over
+31
+0.6pp
Data table
Five year age groups for Port Noarlunga. 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 | 138 | 4.3% | 5.4% | 138 | 4.6% | 6.2% | 0 | -0.3pp |
| 5 to 9 | 147 | 4.5% | 6.2% | 176 | 5.9% | 6.4% | -29 | -1.4pp |
| 10 to 14 | 197 | 6.1% | 6.2% | 171 | 5.8% | 6.1% | +26 | +0.3pp |
| 15 to 19 | 193 | 5.9% | 5.8% | 164 | 5.5% | 6.2% | +29 | +0.4pp |
| 20 to 24 | 153 | 4.7% | 5.6% | 155 | 5.2% | 6.0% | -2 | -0.5pp |
| 25 to 29 | 203 | 6.3% | 6.0% | 124 | 4.2% | 5.9% | +79 | +2.1pp |
| 30 to 34 | 184 | 5.7% | 6.3% | 162 | 5.4% | 6.5% | +22 | +0.3pp |
| 35 to 39 | 180 | 5.5% | 6.7% | 160 | 5.4% | 6.3% | +20 | +0.1pp |
| 40 to 44 | 183 | 5.6% | 6.1% | 231 | 7.8% | 6.6% | -48 | -2.2pp |
| 45 to 49 | 239 | 7.4% | 6.4% | 215 | 7.2% | 6.9% | +24 | +0.2pp |
| 50 to 54 | 253 | 7.8% | 6.6% | 205 | 6.9% | 6.7% | +48 | +0.9pp |
| 55 to 59 | 228 | 7.0% | 6.5% | 220 | 7.4% | 6.6% | +8 | -0.4pp |
| 60 to 64 | 239 | 7.4% | 6.3% | 201 | 6.8% | 6.3% | +38 | +0.6pp |
| 65 to 69 | 202 | 6.2% | 5.9% | 181 | 6.1% | 6.1% | +21 | +0.1pp |
| 70 to 74 | 177 | 5.5% | 5.7% | 143 | 4.8% | 4.3% | +34 | +0.7pp |
| 75 to 79 | 117 | 3.6% | 3.8% | 103 | 3.5% | 2.8% | +14 | +0.1pp |
| 80 to 84 | 85 | 2.6% | 2.3% | 109 | 3.7% | 2.0% | -24 | -1.1pp |
| 85 and over | 147 | 4.5% | 2.2% | 116 | 3.9% | 2.1% | +31 | +0.6pp |
| Total | 3,245 | 100.0% | 100.0% | 2,979 | 100.0% | 100.0% | +266 | 0.0pp |