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, 60 to 64 year olds was the largest age group among residents in Blewitt Springs, accounting for 9.8% (34 people). This share was higher than Onkaparinga (C) (6.3%). Since 2016, the biggest change was in 50 to 54 year olds, which increased by 30 people and 8.7 percentage points.
Section overview
Age structure - Five year age groups
Blewitt Springs - Total persons (Usual residence)
This table summarises five year age groups for Blewitt Springs in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
Chart view
Age structure - Five year age groups snapshot
2021 distribution by category for Blewitt Springs, with comparison markers for Onkaparinga (C).
0 to 4
2021 count
4
% of total
1.2%
Change from 2016
+1.2pp
4
1.2%
+1.2pp
5 to 9
2021 count
25
% of total
7.2%
Change from 2016
+7.2pp
25
7.2%
+7.2pp
10 to 14
2021 count
16
% of total
4.6%
Change from 2016
+4.6pp
16
4.6%
+4.6pp
15 to 19
2021 count
23
% of total
6.6%
Change from 2016
+6.6pp
23
6.6%
+6.6pp
20 to 24
2021 count
16
% of total
4.6%
Change from 2016
+4.6pp
16
4.6%
+4.6pp
25 to 29
2021 count
8
% of total
2.3%
Change from 2016
+2.3pp
8
2.3%
+2.3pp
30 to 34
2021 count
6
% of total
1.7%
Change from 2016
+1.7pp
6
1.7%
+1.7pp
35 to 39
2021 count
25
% of total
7.2%
Change from 2016
+7.2pp
25
7.2%
+7.2pp
40 to 44
2021 count
17
% of total
4.9%
Change from 2016
+4.9pp
17
4.9%
+4.9pp
45 to 49
2021 count
23
% of total
6.6%
Change from 2016
+6.6pp
23
6.6%
+6.6pp
50 to 54
2021 count
30
% of total
8.7%
Change from 2016
+8.7pp
30
8.7%
+8.7pp
55 to 59
2021 count
30
% of total
8.7%
Change from 2016
-1.0pp
30
8.7%
-1.0pp
60 to 64
2021 count
34
% of total
9.8%
Change from 2016
-19.2pp
34
9.8%
-19.2pp
65 to 69
2021 count
27
% of total
7.8%
Change from 2016
+7.8pp
27
7.8%
+7.8pp
70 to 74
2021 count
27
% of total
7.8%
Change from 2016
-11.6pp
27
7.8%
-11.6pp
75 to 79
2021 count
19
% of total
5.5%
Change from 2016
+5.5pp
19
5.5%
+5.5pp
80 to 84
2021 count
10
% of total
2.9%
Change from 2016
+2.9pp
10
2.9%
+2.9pp
85 and over
2021 count
0
% of total
0.0%
Change from 2016
0.0pp
0
0.0%
0.0pp
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+4
+1.2pp
5 to 9
+25
+7.2pp
10 to 14
+16
+4.6pp
15 to 19
+23
+6.6pp
20 to 24
+16
+4.6pp
25 to 29
+8
+2.3pp
30 to 34
+6
+1.7pp
35 to 39
+25
+7.2pp
40 to 44
+17
+4.9pp
45 to 49
+23
+6.6pp
50 to 54
+30
+8.7pp
55 to 59
+27
-1.0pp
60 to 64
+25
-19.2pp
65 to 69
+27
+7.8pp
70 to 74
+21
-11.6pp
75 to 79
+19
+5.5pp
80 to 84
+10
+2.9pp
85 and over
0
0.0pp
Data table
Five year age groups for Blewitt Springs. 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 | 4 | 1.2% | 5.4% | 0 | 0.0% | 6.2% | +4 | +1.2pp |
| 5 to 9 | 25 | 7.2% | 6.2% | 0 | 0.0% | 6.4% | +25 | +7.2pp |
| 10 to 14 | 16 | 4.6% | 6.2% | 0 | 0.0% | 6.1% | +16 | +4.6pp |
| 15 to 19 | 23 | 6.6% | 5.8% | 0 | 0.0% | 6.2% | +23 | +6.6pp |
| 20 to 24 | 16 | 4.6% | 5.6% | 0 | 0.0% | 6.0% | +16 | +4.6pp |
| 25 to 29 | 8 | 2.3% | 6.0% | 0 | 0.0% | 5.9% | +8 | +2.3pp |
| 30 to 34 | 6 | 1.7% | 6.3% | 0 | 0.0% | 6.5% | +6 | +1.7pp |
| 35 to 39 | 25 | 7.2% | 6.7% | 0 | 0.0% | 6.3% | +25 | +7.2pp |
| 40 to 44 | 17 | 4.9% | 6.1% | 0 | 0.0% | 6.6% | +17 | +4.9pp |
| 45 to 49 | 23 | 6.6% | 6.4% | 0 | 0.0% | 6.9% | +23 | +6.6pp |
| 50 to 54 | 30 | 8.7% | 6.6% | 0 | 0.0% | 6.7% | +30 | +8.7pp |
| 55 to 59 | 30 | 8.7% | 6.5% | 3 | 9.7% | 6.6% | +27 | -1.0pp |
| 60 to 64 | 34 | 9.8% | 6.3% | 9 | 29.0% | 6.3% | +25 | -19.2pp |
| 65 to 69 | 27 | 7.8% | 5.9% | 0 | 0.0% | 6.1% | +27 | +7.8pp |
| 70 to 74 | 27 | 7.8% | 5.7% | 6 | 19.4% | 4.3% | +21 | -11.6pp |
| 75 to 79 | 19 | 5.5% | 3.8% | 0 | 0.0% | 2.8% | +19 | +5.5pp |
| 80 to 84 | 10 | 2.9% | 2.3% | 0 | 0.0% | 2.0% | +10 | +2.9pp |
| 85 and over | 0 | 0.0% | 2.2% | 0 | 0.0% | 2.1% | 0 | 0.0pp |
| Total | 346 | 100.0% | 100.0% | 31 | 100.0% | 100.0% | +315 | 0.0pp |