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, 45 to 49 year olds was the largest age group among residents in The Basin (Vic.), accounting for 7.5% (338 people). This share was higher than Knox (C) (6.7%). Since 2016, the biggest change was in 70 to 74 year olds, which increased by 71 people and 1.5 percentage points.
Section overview
Age structure - Five year age groups
The Basin (Vic.) - Total persons (Usual residence)
This table summarises five year age groups for The Basin (Vic.) 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 The Basin (Vic.), with comparison markers for Knox (C).
0 to 4
2021 count
257
% of total
5.7%
Change from 2016
-1.0pp
257
5.7%
-1.0pp
5 to 9
2021 count
309
% of total
6.9%
Change from 2016
+0.1pp
309
6.9%
+0.1pp
10 to 14
2021 count
300
% of total
6.7%
Change from 2016
+0.4pp
300
6.7%
+0.4pp
15 to 19
2021 count
276
% of total
6.1%
Change from 2016
+0.1pp
276
6.1%
+0.1pp
20 to 24
2021 count
224
% of total
5.0%
Change from 2016
0.0pp
224
5.0%
0.0pp
25 to 29
2021 count
208
% of total
4.6%
Change from 2016
-1.5pp
208
4.6%
-1.5pp
30 to 34
2021 count
314
% of total
7.0%
Change from 2016
+0.8pp
314
7.0%
+0.8pp
35 to 39
2021 count
318
% of total
7.1%
Change from 2016
+0.4pp
318
7.1%
+0.4pp
40 to 44
2021 count
289
% of total
6.4%
Change from 2016
-1.3pp
289
6.4%
-1.3pp
45 to 49
2021 count
338
% of total
7.5%
Change from 2016
-0.1pp
338
7.5%
-0.1pp
50 to 54
2021 count
320
% of total
7.1%
Change from 2016
-0.1pp
320
7.1%
-0.1pp
55 to 59
2021 count
298
% of total
6.6%
Change from 2016
-0.1pp
298
6.6%
-0.1pp
60 to 64
2021 count
271
% of total
6.0%
Change from 2016
0.0pp
271
6.0%
0.0pp
65 to 69
2021 count
241
% of total
5.4%
Change from 2016
+0.2pp
241
5.4%
+0.2pp
70 to 74
2021 count
202
% of total
4.5%
Change from 2016
+1.5pp
202
4.5%
+1.5pp
75 to 79
2021 count
131
% of total
2.9%
Change from 2016
+1.0pp
131
2.9%
+1.0pp
80 to 84
2021 count
83
% of total
1.8%
Change from 2016
+0.2pp
83
1.8%
+0.2pp
85 and over
2021 count
114
% of total
2.5%
Change from 2016
-0.1pp
114
2.5%
-0.1pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-37
-1.0pp
5 to 9
+10
+0.1pp
10 to 14
+22
+0.4pp
15 to 19
+10
+0.1pp
20 to 24
+1
0.0pp
25 to 29
-60
-1.5pp
30 to 34
+39
+0.8pp
35 to 39
+23
+0.4pp
40 to 44
-51
-1.3pp
45 to 49
+2
-0.1pp
50 to 54
+2
-0.1pp
55 to 59
+2
-0.1pp
60 to 64
+7
0.0pp
65 to 69
+11
+0.2pp
70 to 74
+71
+1.5pp
75 to 79
+48
+1.0pp
80 to 84
+13
+0.2pp
85 and over
+1
-0.1pp
Data table
Five year age groups for The Basin (Vic.). 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 | 257 | 5.7% | 5.3% | 294 | 6.7% | 5.9% | -37 | -1.0pp |
| 5 to 9 | 309 | 6.9% | 5.9% | 299 | 6.8% | 5.9% | +10 | +0.1pp |
| 10 to 14 | 300 | 6.7% | 5.8% | 278 | 6.3% | 5.8% | +22 | +0.4pp |
| 15 to 19 | 276 | 6.1% | 5.9% | 266 | 6.0% | 6.4% | +10 | +0.1pp |
| 20 to 24 | 224 | 5.0% | 6.1% | 223 | 5.0% | 6.6% | +1 | 0.0pp |
| 25 to 29 | 208 | 4.6% | 6.0% | 268 | 6.1% | 6.4% | -60 | -1.5pp |
| 30 to 34 | 314 | 7.0% | 6.7% | 275 | 6.2% | 6.8% | +39 | +0.8pp |
| 35 to 39 | 318 | 7.1% | 7.2% | 295 | 6.7% | 6.7% | +23 | +0.4pp |
| 40 to 44 | 289 | 6.4% | 6.8% | 340 | 7.7% | 6.8% | -51 | -1.3pp |
| 45 to 49 | 338 | 7.5% | 6.7% | 336 | 7.6% | 7.2% | +2 | -0.1pp |
| 50 to 54 | 320 | 7.1% | 6.8% | 318 | 7.2% | 7.2% | +2 | -0.1pp |
| 55 to 59 | 298 | 6.6% | 6.7% | 296 | 6.7% | 6.8% | +2 | -0.1pp |
| 60 to 64 | 271 | 6.0% | 6.2% | 264 | 6.0% | 6.1% | +7 | 0.0pp |
| 65 to 69 | 241 | 5.4% | 5.4% | 230 | 5.2% | 5.2% | +11 | +0.2pp |
| 70 to 74 | 202 | 4.5% | 4.6% | 131 | 3.0% | 3.6% | +71 | +1.5pp |
| 75 to 79 | 131 | 2.9% | 3.2% | 83 | 1.9% | 2.7% | +48 | +1.0pp |
| 80 to 84 | 83 | 1.8% | 2.4% | 70 | 1.6% | 1.9% | +13 | +0.2pp |
| 85 and over | 114 | 2.5% | 2.2% | 113 | 2.6% | 2.0% | +1 | -0.1pp |
| Total | 4,497 | 100.0% | 100.0% | 4,416 | 100.0% | 100.0% | +81 | 0.0pp |