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 Old Noarlunga, accounting for 7.4% (114 people). This share was higher than Onkaparinga (C) (6.4%). Since 2016, the biggest change was in 5 to 9 year olds, which decreased by 32 people and 2.5 percentage points.
Section overview
Age structure - Five year age groups
Old Noarlunga - Total persons (Usual residence)
This table summarises five year age groups for Old 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 Old Noarlunga, with comparison markers for Onkaparinga (C).
0 to 4
2021 count
79
% of total
5.2%
Change from 2016
-2.1pp
79
5.2%
-2.1pp
5 to 9
2021 count
79
% of total
5.2%
Change from 2016
-2.5pp
79
5.2%
-2.5pp
10 to 14
2021 count
106
% of total
6.9%
Change from 2016
+1.0pp
106
6.9%
+1.0pp
15 to 19
2021 count
85
% of total
5.6%
Change from 2016
+0.4pp
85
5.6%
+0.4pp
20 to 24
2021 count
99
% of total
6.5%
Change from 2016
+0.8pp
99
6.5%
+0.8pp
25 to 29
2021 count
110
% of total
7.2%
Change from 2016
+1.1pp
110
7.2%
+1.1pp
30 to 34
2021 count
97
% of total
6.3%
Change from 2016
-0.3pp
97
6.3%
-0.3pp
35 to 39
2021 count
87
% of total
5.7%
Change from 2016
-1.3pp
87
5.7%
-1.3pp
40 to 44
2021 count
99
% of total
6.5%
Change from 2016
+0.1pp
99
6.5%
+0.1pp
45 to 49
2021 count
114
% of total
7.4%
Change from 2016
+1.2pp
114
7.4%
+1.2pp
50 to 54
2021 count
91
% of total
5.9%
Change from 2016
-1.1pp
91
5.9%
-1.1pp
55 to 59
2021 count
96
% of total
6.3%
Change from 2016
-0.8pp
96
6.3%
-0.8pp
60 to 64
2021 count
105
% of total
6.9%
Change from 2016
-0.2pp
105
6.9%
-0.2pp
65 to 69
2021 count
94
% of total
6.1%
Change from 2016
-0.7pp
94
6.1%
-0.7pp
70 to 74
2021 count
74
% of total
4.8%
Change from 2016
+0.8pp
74
4.8%
+0.8pp
75 to 79
2021 count
47
% of total
3.1%
Change from 2016
+0.5pp
47
3.1%
+0.5pp
80 to 84
2021 count
29
% of total
1.9%
Change from 2016
+0.2pp
29
1.9%
+0.2pp
85 and over
2021 count
24
% of total
1.6%
Change from 2016
+0.5pp
24
1.6%
+0.5pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-27
-2.1pp
5 to 9
-32
-2.5pp
10 to 14
+21
+1.0pp
15 to 19
+10
+0.4pp
20 to 24
+17
+0.8pp
25 to 29
+21
+1.1pp
30 to 34
+2
-0.3pp
35 to 39
-15
-1.3pp
40 to 44
+6
+0.1pp
45 to 49
+24
+1.2pp
50 to 54
-11
-1.1pp
55 to 59
-7
-0.8pp
60 to 64
+2
-0.2pp
65 to 69
-4
-0.7pp
70 to 74
+16
+0.8pp
75 to 79
+9
+0.5pp
80 to 84
+4
+0.2pp
85 and over
+8
+0.5pp
Data table
Five year age groups for Old 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 | 79 | 5.2% | 5.4% | 106 | 7.3% | 6.2% | -27 | -2.1pp |
| 5 to 9 | 79 | 5.2% | 6.2% | 111 | 7.7% | 6.4% | -32 | -2.5pp |
| 10 to 14 | 106 | 6.9% | 6.2% | 85 | 5.9% | 6.1% | +21 | +1.0pp |
| 15 to 19 | 85 | 5.6% | 5.8% | 75 | 5.2% | 6.2% | +10 | +0.4pp |
| 20 to 24 | 99 | 6.5% | 5.6% | 82 | 5.7% | 6.0% | +17 | +0.8pp |
| 25 to 29 | 110 | 7.2% | 6.0% | 89 | 6.1% | 5.9% | +21 | +1.1pp |
| 30 to 34 | 97 | 6.3% | 6.3% | 95 | 6.6% | 6.5% | +2 | -0.3pp |
| 35 to 39 | 87 | 5.7% | 6.7% | 102 | 7.0% | 6.3% | -15 | -1.3pp |
| 40 to 44 | 99 | 6.5% | 6.1% | 93 | 6.4% | 6.6% | +6 | +0.1pp |
| 45 to 49 | 114 | 7.4% | 6.4% | 90 | 6.2% | 6.9% | +24 | +1.2pp |
| 50 to 54 | 91 | 5.9% | 6.6% | 102 | 7.0% | 6.7% | -11 | -1.1pp |
| 55 to 59 | 96 | 6.3% | 6.5% | 103 | 7.1% | 6.6% | -7 | -0.8pp |
| 60 to 64 | 105 | 6.9% | 6.3% | 103 | 7.1% | 6.3% | +2 | -0.2pp |
| 65 to 69 | 94 | 6.1% | 5.9% | 98 | 6.8% | 6.1% | -4 | -0.7pp |
| 70 to 74 | 74 | 4.8% | 5.7% | 58 | 4.0% | 4.3% | +16 | +0.8pp |
| 75 to 79 | 47 | 3.1% | 3.8% | 38 | 2.6% | 2.8% | +9 | +0.5pp |
| 80 to 84 | 29 | 1.9% | 2.3% | 25 | 1.7% | 2.0% | +4 | +0.2pp |
| 85 and over | 24 | 1.6% | 2.2% | 16 | 1.1% | 2.1% | +8 | +0.5pp |
| Total | 1,531 | 100.0% | 100.0% | 1,449 | 100.0% | 100.0% | +82 | 0.0pp |