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 Willunga, accounting for 7.8% (191 people). This share was higher than Onkaparinga (C) (6.6%). Since 2016, the biggest change was in 70 to 74 year olds, which increased by 60 people and 2.2 percentage points.
Section overview
Age structure - Five year age groups
Willunga - Total persons (Usual residence)
This table summarises five year age groups for Willunga 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 Willunga, with comparison markers for Onkaparinga (C).
0 to 4
2021 count
91
% of total
3.7%
Change from 2016
-1.4pp
91
3.7%
-1.4pp
5 to 9
2021 count
167
% of total
6.8%
Change from 2016
-0.3pp
167
6.8%
-0.3pp
10 to 14
2021 count
171
% of total
7.0%
Change from 2016
-0.2pp
171
7.0%
-0.2pp
15 to 19
2021 count
132
% of total
5.4%
Change from 2016
-1.9pp
132
5.4%
-1.9pp
20 to 24
2021 count
103
% of total
4.2%
Change from 2016
-0.1pp
103
4.2%
-0.1pp
25 to 29
2021 count
80
% of total
3.3%
Change from 2016
+0.1pp
80
3.3%
+0.1pp
30 to 34
2021 count
77
% of total
3.1%
Change from 2016
-0.8pp
77
3.1%
-0.8pp
35 to 39
2021 count
133
% of total
5.4%
Change from 2016
-0.8pp
133
5.4%
-0.8pp
40 to 44
2021 count
164
% of total
6.7%
Change from 2016
-1.1pp
164
6.7%
-1.1pp
45 to 49
2021 count
183
% of total
7.5%
Change from 2016
-0.4pp
183
7.5%
-0.4pp
50 to 54
2021 count
191
% of total
7.8%
Change from 2016
+1.5pp
191
7.8%
+1.5pp
55 to 59
2021 count
174
% of total
7.1%
Change from 2016
-0.9pp
174
7.1%
-0.9pp
60 to 64
2021 count
182
% of total
7.4%
Change from 2016
+0.3pp
182
7.4%
+0.3pp
65 to 69
2021 count
190
% of total
7.8%
Change from 2016
+1.7pp
190
7.8%
+1.7pp
70 to 74
2021 count
155
% of total
6.3%
Change from 2016
+2.2pp
155
6.3%
+2.2pp
75 to 79
2021 count
109
% of total
4.5%
Change from 2016
-0.4pp
109
4.5%
-0.4pp
80 to 84
2021 count
79
% of total
3.2%
Change from 2016
+1.3pp
79
3.2%
+1.3pp
85 and over
2021 count
43
% of total
1.8%
Change from 2016
-0.4pp
43
1.8%
-0.4pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-27
-1.4pp
5 to 9
+3
-0.3pp
10 to 14
+5
-0.2pp
15 to 19
-36
-1.9pp
20 to 24
+4
-0.1pp
25 to 29
+7
+0.1pp
30 to 34
-12
-0.8pp
35 to 39
-11
-0.8pp
40 to 44
-16
-1.1pp
45 to 49
0
-0.4pp
50 to 54
+45
+1.5pp
55 to 59
-11
-0.9pp
60 to 64
+18
+0.3pp
65 to 69
+50
+1.7pp
70 to 74
+60
+2.2pp
75 to 79
-5
-0.4pp
80 to 84
+35
+1.3pp
85 and over
-7
-0.4pp
Data table
Five year age groups for Willunga. 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 | 91 | 3.7% | 5.4% | 118 | 5.1% | 6.2% | -27 | -1.4pp |
| 5 to 9 | 167 | 6.8% | 6.2% | 164 | 7.1% | 6.4% | +3 | -0.3pp |
| 10 to 14 | 171 | 7.0% | 6.2% | 166 | 7.2% | 6.1% | +5 | -0.2pp |
| 15 to 19 | 132 | 5.4% | 5.8% | 168 | 7.3% | 6.2% | -36 | -1.9pp |
| 20 to 24 | 103 | 4.2% | 5.6% | 99 | 4.3% | 6.0% | +4 | -0.1pp |
| 25 to 29 | 80 | 3.3% | 6.0% | 73 | 3.2% | 5.9% | +7 | +0.1pp |
| 30 to 34 | 77 | 3.1% | 6.3% | 89 | 3.9% | 6.5% | -12 | -0.8pp |
| 35 to 39 | 133 | 5.4% | 6.7% | 144 | 6.2% | 6.3% | -11 | -0.8pp |
| 40 to 44 | 164 | 6.7% | 6.1% | 180 | 7.8% | 6.6% | -16 | -1.1pp |
| 45 to 49 | 183 | 7.5% | 6.4% | 183 | 7.9% | 6.9% | 0 | -0.4pp |
| 50 to 54 | 191 | 7.8% | 6.6% | 146 | 6.3% | 6.7% | +45 | +1.5pp |
| 55 to 59 | 174 | 7.1% | 6.5% | 185 | 8.0% | 6.6% | -11 | -0.9pp |
| 60 to 64 | 182 | 7.4% | 6.3% | 164 | 7.1% | 6.3% | +18 | +0.3pp |
| 65 to 69 | 190 | 7.8% | 5.9% | 140 | 6.1% | 6.1% | +50 | +1.7pp |
| 70 to 74 | 155 | 6.3% | 5.7% | 95 | 4.1% | 4.3% | +60 | +2.2pp |
| 75 to 79 | 109 | 4.5% | 3.8% | 114 | 4.9% | 2.8% | -5 | -0.4pp |
| 80 to 84 | 79 | 3.2% | 2.3% | 44 | 1.9% | 2.0% | +35 | +1.3pp |
| 85 and over | 43 | 1.8% | 2.2% | 50 | 2.2% | 2.1% | -7 | -0.4pp |
| Total | 2,445 | 100.0% | 100.0% | 2,308 | 100.0% | 100.0% | +137 | 0.0pp |