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 Riverhills, accounting for 9.2% (378 people). This share was higher than Brisbane (C) (8.1%). Since 2016, the biggest change was in 10 to 14 year olds, which increased by 75 people and 1.7 percentage points.
Section overview
Age structure - Five year age groups
Riverhills - Total persons (Usual residence)
This table summarises five year age groups for Riverhills in 2021 for persons, with comparison against Brisbane (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Riverhills, with comparison markers for Brisbane (C).
0 to 4
2021 count
260
% of total
6.3%
Change from 2016
-1.6pp
260
6.3%
-1.6pp
5 to 9
2021 count
297
% of total
7.2%
Change from 2016
-1.0pp
297
7.2%
-1.0pp
10 to 14
2021 count
329
% of total
8.0%
Change from 2016
+1.7pp
329
8.0%
+1.7pp
15 to 19
2021 count
246
% of total
6.0%
Change from 2016
+1.1pp
246
6.0%
+1.1pp
20 to 24
2021 count
218
% of total
5.3%
Change from 2016
-0.6pp
218
5.3%
-0.6pp
25 to 29
2021 count
234
% of total
5.7%
Change from 2016
-1.8pp
234
5.7%
-1.8pp
30 to 34
2021 count
342
% of total
8.3%
Change from 2016
-1.9pp
342
8.3%
-1.9pp
35 to 39
2021 count
378
% of total
9.2%
Change from 2016
+1.3pp
378
9.2%
+1.3pp
40 to 44
2021 count
322
% of total
7.8%
Change from 2016
+0.1pp
322
7.8%
+0.1pp
45 to 49
2021 count
295
% of total
7.2%
Change from 2016
+1.3pp
295
7.2%
+1.3pp
50 to 54
2021 count
216
% of total
5.2%
Change from 2016
-0.1pp
216
5.2%
-0.1pp
55 to 59
2021 count
215
% of total
5.2%
Change from 2016
-1.3pp
215
5.2%
-1.3pp
60 to 64
2021 count
233
% of total
5.7%
Change from 2016
+0.6pp
233
5.7%
+0.6pp
65 to 69
2021 count
204
% of total
5.0%
Change from 2016
+0.4pp
204
5.0%
+0.4pp
70 to 74
2021 count
164
% of total
4.0%
Change from 2016
+0.9pp
164
4.0%
+0.9pp
75 to 79
2021 count
109
% of total
2.6%
Change from 2016
+1.3pp
109
2.6%
+1.3pp
80 to 84
2021 count
44
% of total
1.1%
Change from 2016
+0.2pp
44
1.1%
+0.2pp
85 and over
2021 count
45
% of total
1.1%
Change from 2016
+0.3pp
45
1.1%
+0.3pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-59
-1.6pp
5 to 9
-35
-1.0pp
10 to 14
+75
+1.7pp
15 to 19
+46
+1.1pp
20 to 24
-20
-0.6pp
25 to 29
-70
-1.8pp
30 to 34
-69
-1.9pp
35 to 39
+58
+1.3pp
40 to 44
+10
+0.1pp
45 to 49
+57
+1.3pp
50 to 54
+1
-0.1pp
55 to 59
-48
-1.3pp
60 to 64
+28
+0.6pp
65 to 69
+17
+0.4pp
70 to 74
+37
+0.9pp
75 to 79
+58
+1.3pp
80 to 84
+8
+0.2pp
85 and over
+14
+0.3pp
Data table
Five year age groups for Riverhills. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Brisbane (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Brisbane (C)% | Count | % | Brisbane (C)% | Count | pp | |
| 0 to 4 | 260 | 6.3% | 5.5% | 319 | 7.9% | 6.0% | -59 | -1.6pp |
| 5 to 9 | 297 | 7.2% | 6.0% | 332 | 8.2% | 6.0% | -35 | -1.0pp |
| 10 to 14 | 329 | 8.0% | 6.0% | 254 | 6.3% | 5.6% | +75 | +1.7pp |
| 15 to 19 | 246 | 6.0% | 6.0% | 200 | 4.9% | 6.2% | +46 | +1.1pp |
| 20 to 24 | 218 | 5.3% | 7.8% | 238 | 5.9% | 8.7% | -20 | -0.6pp |
| 25 to 29 | 234 | 5.7% | 8.4% | 304 | 7.5% | 8.8% | -70 | -1.8pp |
| 30 to 34 | 342 | 8.3% | 8.3% | 411 | 10.2% | 8.5% | -69 | -1.9pp |
| 35 to 39 | 378 | 9.2% | 8.1% | 320 | 7.9% | 7.4% | +58 | +1.3pp |
| 40 to 44 | 322 | 7.8% | 7.1% | 312 | 7.7% | 7.3% | +10 | +0.1pp |
| 45 to 49 | 295 | 7.2% | 6.8% | 238 | 5.9% | 6.9% | +57 | +1.3pp |
| 50 to 54 | 216 | 5.2% | 6.3% | 215 | 5.3% | 6.1% | +1 | -0.1pp |
| 55 to 59 | 215 | 5.2% | 5.5% | 263 | 6.5% | 5.4% | -48 | -1.3pp |
| 60 to 64 | 233 | 5.7% | 4.8% | 205 | 5.1% | 4.6% | +28 | +0.6pp |
| 65 to 69 | 204 | 5.0% | 4.0% | 187 | 4.6% | 4.0% | +17 | +0.4pp |
| 70 to 74 | 164 | 4.0% | 3.5% | 127 | 3.1% | 2.9% | +37 | +0.9pp |
| 75 to 79 | 109 | 2.6% | 2.5% | 51 | 1.3% | 2.2% | +58 | +1.3pp |
| 80 to 84 | 44 | 1.1% | 1.7% | 36 | 0.9% | 1.6% | +8 | +0.2pp |
| 85 and over | 45 | 1.1% | 1.8% | 31 | 0.8% | 1.8% | +14 | +0.3pp |
| Total | 4,121 | 100.0% | 100.0% | 4,042 | 100.0% | 100.0% | +79 | 0.0pp |