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, 35 to 39 year olds was the largest age group among residents in Wantirna, accounting for 7.4% (1,050 people). This share was higher than Knox (C) (7.2%). Since 2016, the biggest change was in 70 to 74 year olds, which increased by 309 people and 2.1 percentage points.
Section overview
Age structure - Five year age groups
Wantirna - Total persons (Usual residence)
This table summarises five year age groups for Wantirna in 2021 for persons, with comparison against Knox (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Wantirna, with comparison markers for Knox (C).
0 to 4
2021 count
770
% of total
5.4%
Change from 2016
+0.2pp
770
5.4%
+0.2pp
5 to 9
2021 count
951
% of total
6.7%
Change from 2016
+0.4pp
951
6.7%
+0.4pp
10 to 14
2021 count
918
% of total
6.4%
Change from 2016
+1.1pp
918
6.4%
+1.1pp
15 to 19
2021 count
771
% of total
5.4%
Change from 2016
-0.4pp
771
5.4%
-0.4pp
20 to 24
2021 count
746
% of total
5.2%
Change from 2016
-0.8pp
746
5.2%
-0.8pp
25 to 29
2021 count
664
% of total
4.7%
Change from 2016
-0.8pp
664
4.7%
-0.8pp
30 to 34
2021 count
862
% of total
6.1%
Change from 2016
-0.6pp
862
6.1%
-0.6pp
35 to 39
2021 count
1,050
% of total
7.4%
Change from 2016
+0.7pp
1,050
7.4%
+0.7pp
40 to 44
2021 count
1,042
% of total
7.3%
Change from 2016
+0.9pp
1,042
7.3%
+0.9pp
45 to 49
2021 count
896
% of total
6.3%
Change from 2016
0.0pp
896
6.3%
0.0pp
50 to 54
2021 count
858
% of total
6.0%
Change from 2016
-0.3pp
858
6.0%
-0.3pp
55 to 59
2021 count
805
% of total
5.7%
Change from 2016
-1.5pp
805
5.7%
-1.5pp
60 to 64
2021 count
908
% of total
6.4%
Change from 2016
-1.6pp
908
6.4%
-1.6pp
65 to 69
2021 count
964
% of total
6.8%
Change from 2016
+0.1pp
964
6.8%
+0.1pp
70 to 74
2021 count
838
% of total
5.9%
Change from 2016
+2.1pp
838
5.9%
+2.1pp
75 to 79
2021 count
471
% of total
3.3%
Change from 2016
+0.4pp
471
3.3%
+0.4pp
80 to 84
2021 count
346
% of total
2.4%
Change from 2016
+0.6pp
346
2.4%
+0.6pp
85 and over
2021 count
383
% of total
2.7%
Change from 2016
-0.2pp
383
2.7%
-0.2pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+53
+0.2pp
5 to 9
+86
+0.4pp
10 to 14
+190
+1.1pp
15 to 19
-30
-0.4pp
20 to 24
-77
-0.8pp
25 to 29
-100
-0.8pp
30 to 34
-61
-0.6pp
35 to 39
+121
+0.7pp
40 to 44
+152
+0.9pp
45 to 49
+20
0.0pp
50 to 54
-6
-0.3pp
55 to 59
-190
-1.5pp
60 to 64
-203
-1.6pp
65 to 69
+37
+0.1pp
70 to 74
+309
+2.1pp
75 to 79
+69
+0.4pp
80 to 84
+94
+0.6pp
85 and over
-11
-0.2pp
Data table
Five year age groups for Wantirna. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Knox (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Knox (C)% | Count | % | Knox (C)% | Count | pp | |
| 0 to 4 | 770 | 5.4% | 5.3% | 717 | 5.2% | 5.9% | +53 | +0.2pp |
| 5 to 9 | 951 | 6.7% | 5.9% | 865 | 6.3% | 5.9% | +86 | +0.4pp |
| 10 to 14 | 918 | 6.4% | 5.8% | 728 | 5.3% | 5.8% | +190 | +1.1pp |
| 15 to 19 | 771 | 5.4% | 5.9% | 801 | 5.8% | 6.4% | -30 | -0.4pp |
| 20 to 24 | 746 | 5.2% | 6.1% | 823 | 6.0% | 6.6% | -77 | -0.8pp |
| 25 to 29 | 664 | 4.7% | 6.0% | 764 | 5.5% | 6.4% | -100 | -0.8pp |
| 30 to 34 | 862 | 6.1% | 6.7% | 923 | 6.7% | 6.8% | -61 | -0.6pp |
| 35 to 39 | 1,050 | 7.4% | 7.2% | 929 | 6.7% | 6.7% | +121 | +0.7pp |
| 40 to 44 | 1,042 | 7.3% | 6.8% | 890 | 6.4% | 6.8% | +152 | +0.9pp |
| 45 to 49 | 896 | 6.3% | 6.7% | 876 | 6.3% | 7.2% | +20 | 0.0pp |
| 50 to 54 | 858 | 6.0% | 6.8% | 864 | 6.3% | 7.2% | -6 | -0.3pp |
| 55 to 59 | 805 | 5.7% | 6.7% | 995 | 7.2% | 6.8% | -190 | -1.5pp |
| 60 to 64 | 908 | 6.4% | 6.2% | 1,111 | 8.0% | 6.1% | -203 | -1.6pp |
| 65 to 69 | 964 | 6.8% | 5.4% | 927 | 6.7% | 5.2% | +37 | +0.1pp |
| 70 to 74 | 838 | 5.9% | 4.6% | 529 | 3.8% | 3.6% | +309 | +2.1pp |
| 75 to 79 | 471 | 3.3% | 3.2% | 402 | 2.9% | 2.7% | +69 | +0.4pp |
| 80 to 84 | 346 | 2.4% | 2.4% | 252 | 1.8% | 1.9% | +94 | +0.6pp |
| 85 and over | 383 | 2.7% | 2.2% | 394 | 2.9% | 2.0% | -11 | -0.2pp |
| Total | 14,237 | 100.0% | 100.0% | 13,818 | 100.0% | 100.0% | +419 | 0.0pp |