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 Forestville (SA), accounting for 9.6% (134 people). This share was higher than Unley (C) (6.3%). Since 2016, the biggest change was in 25 to 29 year olds, which increased by 134 people and 9.6 percentage points.
Section overview
Age structure - Five year age groups
Forestville (SA) - Total persons (Usual residence)
This table summarises five year age groups for Forestville (SA) in 2021 for persons, with comparison against Unley (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Forestville (SA), with comparison markers for Unley (C).
0 to 4
2021 count
68
% of total
4.9%
Change from 2016
-6.9pp
68
4.9%
-6.9pp
5 to 9
2021 count
72
% of total
5.1%
Change from 2016
+5.1pp
72
5.1%
+5.1pp
10 to 14
2021 count
70
% of total
5.0%
Change from 2016
+5.0pp
70
5.0%
+5.0pp
15 to 19
2021 count
59
% of total
4.2%
Change from 2016
+4.2pp
59
4.2%
+4.2pp
20 to 24
2021 count
84
% of total
6.0%
Change from 2016
+6.0pp
84
6.0%
+6.0pp
25 to 29
2021 count
134
% of total
9.6%
Change from 2016
+9.6pp
134
9.6%
+9.6pp
30 to 34
2021 count
108
% of total
7.7%
Change from 2016
-4.1pp
108
7.7%
-4.1pp
35 to 39
2021 count
101
% of total
7.2%
Change from 2016
+7.2pp
101
7.2%
+7.2pp
40 to 44
2021 count
128
% of total
9.1%
Change from 2016
+9.1pp
128
9.1%
+9.1pp
45 to 49
2021 count
96
% of total
6.9%
Change from 2016
+6.9pp
96
6.9%
+6.9pp
50 to 54
2021 count
99
% of total
7.1%
Change from 2016
-6.6pp
99
7.1%
-6.6pp
55 to 59
2021 count
86
% of total
6.1%
Change from 2016
-5.7pp
86
6.1%
-5.7pp
60 to 64
2021 count
90
% of total
6.4%
Change from 2016
+6.4pp
90
6.4%
+6.4pp
65 to 69
2021 count
75
% of total
5.4%
Change from 2016
+5.4pp
75
5.4%
+5.4pp
70 to 74
2021 count
57
% of total
4.1%
Change from 2016
-1.8pp
57
4.1%
-1.8pp
75 to 79
2021 count
24
% of total
1.7%
Change from 2016
+1.7pp
24
1.7%
+1.7pp
80 to 84
2021 count
26
% of total
1.9%
Change from 2016
+1.9pp
26
1.9%
+1.9pp
85 and over
2021 count
26
% of total
1.9%
Change from 2016
+1.9pp
26
1.9%
+1.9pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+62
-6.9pp
5 to 9
+72
+5.1pp
10 to 14
+70
+5.0pp
15 to 19
+59
+4.2pp
20 to 24
+84
+6.0pp
25 to 29
+134
+9.6pp
30 to 34
+102
-4.1pp
35 to 39
+101
+7.2pp
40 to 44
+128
+9.1pp
45 to 49
+96
+6.9pp
50 to 54
+92
-6.6pp
55 to 59
+80
-5.7pp
60 to 64
+90
+6.4pp
65 to 69
+75
+5.4pp
70 to 74
+54
-1.8pp
75 to 79
+24
+1.7pp
80 to 84
+26
+1.9pp
85 and over
+26
+1.9pp
Data table
Five year age groups for Forestville (SA). Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Unley (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Unley (C)% | Count | % | Unley (C)% | Count | pp | |
| 0 to 4 | 68 | 4.9% | 4.3% | 6 | 11.8% | 4.7% | +62 | -6.9pp |
| 5 to 9 | 72 | 5.1% | 5.3% | 0 | 0.0% | 5.7% | +72 | +5.1pp |
| 10 to 14 | 70 | 5.0% | 5.8% | 0 | 0.0% | 5.5% | +70 | +5.0pp |
| 15 to 19 | 59 | 4.2% | 5.4% | 0 | 0.0% | 5.8% | +59 | +4.2pp |
| 20 to 24 | 84 | 6.0% | 6.2% | 0 | 0.0% | 6.8% | +84 | +6.0pp |
| 25 to 29 | 134 | 9.6% | 6.3% | 0 | 0.0% | 7.0% | +134 | +9.6pp |
| 30 to 34 | 108 | 7.7% | 6.1% | 6 | 11.8% | 6.6% | +102 | -4.1pp |
| 35 to 39 | 101 | 7.2% | 6.4% | 0 | 0.0% | 6.4% | +101 | +7.2pp |
| 40 to 44 | 128 | 9.1% | 6.6% | 0 | 0.0% | 6.7% | +128 | +9.1pp |
| 45 to 49 | 96 | 6.9% | 6.6% | 0 | 0.0% | 6.7% | +96 | +6.9pp |
| 50 to 54 | 99 | 7.1% | 6.6% | 7 | 13.7% | 6.4% | +92 | -6.6pp |
| 55 to 59 | 86 | 6.1% | 6.0% | 6 | 11.8% | 6.3% | +80 | -5.7pp |
| 60 to 64 | 90 | 6.4% | 6.1% | 0 | 0.0% | 6.3% | +90 | +6.4pp |
| 65 to 69 | 75 | 5.4% | 5.8% | 0 | 0.0% | 5.6% | +75 | +5.4pp |
| 70 to 74 | 57 | 4.1% | 5.5% | 3 | 5.9% | 3.9% | +54 | -1.8pp |
| 75 to 79 | 24 | 1.7% | 3.8% | 0 | 0.0% | 3.0% | +24 | +1.7pp |
| 80 to 84 | 26 | 1.9% | 2.9% | 0 | 0.0% | 2.3% | +26 | +1.9pp |
| 85 and over | 26 | 1.9% | 4.1% | 0 | 0.0% | 4.3% | +26 | +1.9pp |
| Total | 1,400 | 100.0% | 100.0% | 51 | 100.0% | 100.0% | +1,349 | 0.0pp |