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, 20 to 24 year olds was the largest age group among residents in Adelaide, accounting for 20.4% (3,719 people). This share was higher than Adelaide (C) (18.2%). Since 2016, the biggest change was in 25 to 29 year olds, which increased by 675 people and 1.1 percentage points.
Section overview
Age structure - Five year age groups
Adelaide - Total persons (Usual residence)
This table summarises five year age groups for Adelaide in 2021 for persons, with comparison against Adelaide (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Adelaide, with comparison markers for Adelaide (C).
0 to 4
2021 count
318
% of total
1.7%
Change from 2016
-0.5pp
318
1.7%
-0.5pp
5 to 9
2021 count
325
% of total
1.8%
Change from 2016
+0.3pp
325
1.8%
+0.3pp
10 to 14
2021 count
304
% of total
1.7%
Change from 2016
+0.5pp
304
1.7%
+0.5pp
15 to 19
2021 count
847
% of total
4.7%
Change from 2016
-1.9pp
847
4.7%
-1.9pp
20 to 24
2021 count
3,719
% of total
20.4%
Change from 2016
-4.1pp
3,719
20.4%
-4.1pp
25 to 29
2021 count
2,997
% of total
16.5%
Change from 2016
+1.1pp
2,997
16.5%
+1.1pp
30 to 34
2021 count
1,979
% of total
10.9%
Change from 2016
+0.2pp
1,979
10.9%
+0.2pp
35 to 39
2021 count
1,373
% of total
7.5%
Change from 2016
+0.8pp
1,373
7.5%
+0.8pp
40 to 44
2021 count
1,037
% of total
5.7%
Change from 2016
+0.9pp
1,037
5.7%
+0.9pp
45 to 49
2021 count
880
% of total
4.8%
Change from 2016
+0.4pp
880
4.8%
+0.4pp
50 to 54
2021 count
765
% of total
4.2%
Change from 2016
-0.3pp
765
4.2%
-0.3pp
55 to 59
2021 count
804
% of total
4.4%
Change from 2016
+0.2pp
804
4.4%
+0.2pp
60 to 64
2021 count
759
% of total
4.2%
Change from 2016
+0.3pp
759
4.2%
+0.3pp
65 to 69
2021 count
730
% of total
4.0%
Change from 2016
+0.1pp
730
4.0%
+0.1pp
70 to 74
2021 count
644
% of total
3.5%
Change from 2016
+1.2pp
644
3.5%
+1.2pp
75 to 79
2021 count
399
% of total
2.2%
Change from 2016
+0.7pp
399
2.2%
+0.7pp
80 to 84
2021 count
206
% of total
1.1%
Change from 2016
+0.3pp
206
1.1%
+0.3pp
85 and over
2021 count
142
% of total
0.8%
Change from 2016
0.0pp
142
0.8%
0.0pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-17
-0.5pp
5 to 9
+104
+0.3pp
10 to 14
+127
+0.5pp
15 to 19
-157
-1.9pp
20 to 24
+11
-4.1pp
25 to 29
+675
+1.1pp
30 to 34
+369
+0.2pp
35 to 39
+359
+0.8pp
40 to 44
+305
+0.9pp
45 to 49
+215
+0.4pp
50 to 54
+88
-0.3pp
55 to 59
+170
+0.2pp
60 to 64
+164
+0.3pp
65 to 69
+135
+0.1pp
70 to 74
+302
+1.2pp
75 to 79
+170
+0.7pp
80 to 84
+85
+0.3pp
85 and over
+21
0.0pp
Data table
Five year age groups for Adelaide. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Adelaide (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Adelaide (C)% | Count | % | Adelaide (C)% | Count | pp | |
| 0 to 4 | 318 | 1.7% | 2.0% | 335 | 2.2% | 2.3% | -17 | -0.5pp |
| 5 to 9 | 325 | 1.8% | 1.9% | 221 | 1.5% | 1.7% | +104 | +0.3pp |
| 10 to 14 | 304 | 1.7% | 1.9% | 177 | 1.2% | 1.5% | +127 | +0.5pp |
| 15 to 19 | 847 | 4.7% | 5.6% | 1,004 | 6.6% | 7.2% | -157 | -1.9pp |
| 20 to 24 | 3,719 | 20.4% | 18.2% | 3,708 | 24.5% | 21.3% | +11 | -4.1pp |
| 25 to 29 | 2,997 | 16.5% | 14.4% | 2,322 | 15.4% | 13.8% | +675 | +1.1pp |
| 30 to 34 | 1,979 | 10.9% | 10.0% | 1,610 | 10.7% | 9.8% | +369 | +0.2pp |
| 35 to 39 | 1,373 | 7.5% | 7.2% | 1,014 | 6.7% | 6.1% | +359 | +0.8pp |
| 40 to 44 | 1,037 | 5.7% | 5.4% | 732 | 4.8% | 4.7% | +305 | +0.9pp |
| 45 to 49 | 880 | 4.8% | 4.8% | 665 | 4.4% | 4.6% | +215 | +0.4pp |
| 50 to 54 | 765 | 4.2% | 4.3% | 677 | 4.5% | 5.1% | +88 | -0.3pp |
| 55 to 59 | 804 | 4.4% | 4.7% | 634 | 4.2% | 4.5% | +170 | +0.2pp |
| 60 to 64 | 759 | 4.2% | 4.4% | 595 | 3.9% | 4.5% | +164 | +0.3pp |
| 65 to 69 | 730 | 4.0% | 4.5% | 595 | 3.9% | 4.8% | +135 | +0.1pp |
| 70 to 74 | 644 | 3.5% | 4.4% | 342 | 2.3% | 3.1% | +302 | +1.2pp |
| 75 to 79 | 399 | 2.2% | 2.8% | 229 | 1.5% | 2.2% | +170 | +0.7pp |
| 80 to 84 | 206 | 1.1% | 1.8% | 121 | 0.8% | 1.2% | +85 | +0.3pp |
| 85 and over | 142 | 0.8% | 1.7% | 121 | 0.8% | 1.7% | +21 | 0.0pp |
| Total | 18,202 | 100.0% | 100.0% | 15,115 | 100.0% | 100.0% | +3,087 | 0.0pp |