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, 25 to 29 year olds was the largest age group among residents in Smithfield Plains, accounting for 9.4% (311 people). This share was higher than Playford (C) (8.2%). Since 2016, the biggest change was in 10 to 14 year olds, which increased by 84 people and 1.6 percentage points.
Section overview
Age structure - Five year age groups
Smithfield Plains - Total persons (Usual residence)
This table summarises five year age groups for Smithfield Plains in 2021 for persons, with comparison against Playford (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Smithfield Plains, with comparison markers for Playford (C).
0 to 4
2021 count
279
% of total
8.4%
Change from 2016
-2.0pp
279
8.4%
-2.0pp
5 to 9
2021 count
305
% of total
9.2%
Change from 2016
-0.3pp
305
9.2%
-0.3pp
10 to 14
2021 count
291
% of total
8.8%
Change from 2016
+1.6pp
291
8.8%
+1.6pp
15 to 19
2021 count
235
% of total
7.1%
Change from 2016
+0.2pp
235
7.1%
+0.2pp
20 to 24
2021 count
234
% of total
7.1%
Change from 2016
-1.2pp
234
7.1%
-1.2pp
25 to 29
2021 count
311
% of total
9.4%
Change from 2016
+0.5pp
311
9.4%
+0.5pp
30 to 34
2021 count
269
% of total
8.1%
Change from 2016
-0.6pp
269
8.1%
-0.6pp
35 to 39
2021 count
247
% of total
7.5%
Change from 2016
+1.3pp
247
7.5%
+1.3pp
40 to 44
2021 count
201
% of total
6.1%
Change from 2016
+0.4pp
201
6.1%
+0.4pp
45 to 49
2021 count
177
% of total
5.4%
Change from 2016
-0.6pp
177
5.4%
-0.6pp
50 to 54
2021 count
178
% of total
5.4%
Change from 2016
+0.2pp
178
5.4%
+0.2pp
55 to 59
2021 count
143
% of total
4.3%
Change from 2016
-0.4pp
143
4.3%
-0.4pp
60 to 64
2021 count
141
% of total
4.3%
Change from 2016
+0.1pp
141
4.3%
+0.1pp
65 to 69
2021 count
98
% of total
3.0%
Change from 2016
-0.5pp
98
3.0%
-0.5pp
70 to 74
2021 count
95
% of total
2.9%
Change from 2016
+0.3pp
95
2.9%
+0.3pp
75 to 79
2021 count
69
% of total
2.1%
Change from 2016
+0.7pp
69
2.1%
+0.7pp
80 to 84
2021 count
26
% of total
0.8%
Change from 2016
-0.2pp
26
0.8%
-0.2pp
85 and over
2021 count
24
% of total
0.7%
Change from 2016
+0.2pp
24
0.7%
+0.2pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-19
-2.0pp
5 to 9
+32
-0.3pp
10 to 14
+84
+1.6pp
15 to 19
+37
+0.2pp
20 to 24
-5
-1.2pp
25 to 29
+56
+0.5pp
30 to 34
+20
-0.6pp
35 to 39
+70
+1.3pp
40 to 44
+38
+0.4pp
45 to 49
+6
-0.6pp
50 to 54
+29
+0.2pp
55 to 59
+7
-0.4pp
60 to 64
+19
+0.1pp
65 to 69
-3
-0.5pp
70 to 74
+21
+0.3pp
75 to 79
+28
+0.7pp
80 to 84
-2
-0.2pp
85 and over
+9
+0.2pp
Data table
Five year age groups for Smithfield Plains. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Playford (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Playford (C)% | Count | % | Playford (C)% | Count | pp | |
| 0 to 4 | 279 | 8.4% | 7.5% | 298 | 10.4% | 8.6% | -19 | -2.0pp |
| 5 to 9 | 305 | 9.2% | 8.0% | 273 | 9.5% | 7.9% | +32 | -0.3pp |
| 10 to 14 | 291 | 8.8% | 7.4% | 207 | 7.2% | 6.6% | +84 | +1.6pp |
| 15 to 19 | 235 | 7.1% | 6.2% | 198 | 6.9% | 6.7% | +37 | +0.2pp |
| 20 to 24 | 234 | 7.1% | 7.0% | 239 | 8.3% | 7.7% | -5 | -1.2pp |
| 25 to 29 | 311 | 9.4% | 8.2% | 255 | 8.9% | 7.9% | +56 | +0.5pp |
| 30 to 34 | 269 | 8.1% | 7.7% | 249 | 8.7% | 7.4% | +20 | -0.6pp |
| 35 to 39 | 247 | 7.5% | 7.1% | 177 | 6.2% | 6.1% | +70 | +1.3pp |
| 40 to 44 | 201 | 6.1% | 5.7% | 163 | 5.7% | 5.9% | +38 | +0.4pp |
| 45 to 49 | 177 | 5.4% | 5.7% | 171 | 6.0% | 6.2% | +6 | -0.6pp |
| 50 to 54 | 178 | 5.4% | 5.7% | 149 | 5.2% | 6.5% | +29 | +0.2pp |
| 55 to 59 | 143 | 4.3% | 5.8% | 136 | 4.7% | 5.8% | +7 | -0.4pp |
| 60 to 64 | 141 | 4.3% | 5.1% | 122 | 4.2% | 4.5% | +19 | +0.1pp |
| 65 to 69 | 98 | 3.0% | 4.0% | 101 | 3.5% | 3.9% | -3 | -0.5pp |
| 70 to 74 | 95 | 2.9% | 3.3% | 74 | 2.6% | 2.8% | +21 | +0.3pp |
| 75 to 79 | 69 | 2.1% | 2.2% | 41 | 1.4% | 2.3% | +28 | +0.7pp |
| 80 to 84 | 26 | 0.8% | 1.7% | 28 | 1.0% | 1.7% | -2 | -0.2pp |
| 85 and over | 24 | 0.7% | 1.6% | 15 | 0.5% | 1.5% | +9 | +0.2pp |
| Total | 3,305 | 100.0% | 100.0% | 2,873 | 100.0% | 100.0% | +432 | 0.0pp |