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, 10 to 14 year olds was the largest age group among residents in Ridgewood (WA), accounting for 7.7% (355 people). This share was higher than Wanneroo (C) (7.4%). Since 2016, the biggest change was in 0 to 4 year olds, which decreased by 132 people and 2.7 percentage points.
Section overview
Age structure - Five year age groups
Ridgewood (WA) - Total persons (Usual residence)
This table summarises five year age groups for Ridgewood (WA) in 2021 for persons, with comparison against Wanneroo (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Ridgewood (WA), with comparison markers for Wanneroo (C).
0 to 4
2021 count
272
% of total
5.9%
Change from 2016
-2.7pp
272
5.9%
-2.7pp
5 to 9
2021 count
319
% of total
6.9%
Change from 2016
-1.3pp
319
6.9%
-1.3pp
10 to 14
2021 count
355
% of total
7.7%
Change from 2016
0.0pp
355
7.7%
0.0pp
15 to 19
2021 count
353
% of total
7.6%
Change from 2016
+1.2pp
353
7.6%
+1.2pp
20 to 24
2021 count
295
% of total
6.4%
Change from 2016
-1.6pp
295
6.4%
-1.6pp
25 to 29
2021 count
324
% of total
7.0%
Change from 2016
-0.3pp
324
7.0%
-0.3pp
30 to 34
2021 count
310
% of total
6.7%
Change from 2016
-0.7pp
310
6.7%
-0.7pp
35 to 39
2021 count
314
% of total
6.8%
Change from 2016
-0.5pp
314
6.8%
-0.5pp
40 to 44
2021 count
309
% of total
6.7%
Change from 2016
-0.1pp
309
6.7%
-0.1pp
45 to 49
2021 count
292
% of total
6.3%
Change from 2016
-0.7pp
292
6.3%
-0.7pp
50 to 54
2021 count
312
% of total
6.7%
Change from 2016
+1.4pp
312
6.7%
+1.4pp
55 to 59
2021 count
251
% of total
5.4%
Change from 2016
+2.1pp
251
5.4%
+2.1pp
60 to 64
2021 count
176
% of total
3.8%
Change from 2016
+0.1pp
176
3.8%
+0.1pp
65 to 69
2021 count
147
% of total
3.2%
Change from 2016
-0.2pp
147
3.2%
-0.2pp
70 to 74
2021 count
165
% of total
3.6%
Change from 2016
+0.5pp
165
3.6%
+0.5pp
75 to 79
2021 count
170
% of total
3.7%
Change from 2016
+0.3pp
170
3.7%
+0.3pp
80 to 84
2021 count
169
% of total
3.7%
Change from 2016
+1.7pp
169
3.7%
+1.7pp
85 and over
2021 count
64
% of total
1.4%
Change from 2016
+0.4pp
64
1.4%
+0.4pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-132
-2.7pp
5 to 9
-65
-1.3pp
10 to 14
-5
0.0pp
15 to 19
+53
+1.2pp
20 to 24
-77
-1.6pp
25 to 29
-18
-0.3pp
30 to 34
-34
-0.7pp
35 to 39
-26
-0.5pp
40 to 44
-11
-0.1pp
45 to 49
-35
-0.7pp
50 to 54
+63
+1.4pp
55 to 59
+99
+2.1pp
60 to 64
+3
+0.1pp
65 to 69
-12
-0.2pp
70 to 74
+21
+0.5pp
75 to 79
+9
+0.3pp
80 to 84
+76
+1.7pp
85 and over
+19
+0.4pp
Data table
Five year age groups for Ridgewood (WA). Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Wanneroo (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Wanneroo (C)% | Count | % | Wanneroo (C)% | Count | pp | |
| 0 to 4 | 272 | 5.9% | 7.1% | 404 | 8.6% | 8.0% | -132 | -2.7pp |
| 5 to 9 | 319 | 6.9% | 7.6% | 384 | 8.2% | 7.9% | -65 | -1.3pp |
| 10 to 14 | 355 | 7.7% | 7.4% | 360 | 7.7% | 7.1% | -5 | 0.0pp |
| 15 to 19 | 353 | 7.6% | 6.6% | 300 | 6.4% | 7.1% | +53 | +1.2pp |
| 20 to 24 | 295 | 6.4% | 6.4% | 372 | 8.0% | 6.8% | -77 | -1.6pp |
| 25 to 29 | 324 | 7.0% | 6.5% | 342 | 7.3% | 7.5% | -18 | -0.3pp |
| 30 to 34 | 310 | 6.7% | 7.4% | 344 | 7.4% | 8.1% | -34 | -0.7pp |
| 35 to 39 | 314 | 6.8% | 7.9% | 340 | 7.3% | 7.5% | -26 | -0.5pp |
| 40 to 44 | 309 | 6.7% | 6.9% | 320 | 6.8% | 7.6% | -11 | -0.1pp |
| 45 to 49 | 292 | 6.3% | 7.0% | 327 | 7.0% | 7.4% | -35 | -0.7pp |
| 50 to 54 | 312 | 6.7% | 6.7% | 249 | 5.3% | 6.2% | +63 | +1.4pp |
| 55 to 59 | 251 | 5.4% | 5.7% | 152 | 3.3% | 5.0% | +99 | +2.1pp |
| 60 to 64 | 176 | 3.8% | 4.7% | 173 | 3.7% | 3.9% | +3 | +0.1pp |
| 65 to 69 | 147 | 3.2% | 3.8% | 159 | 3.4% | 3.5% | -12 | -0.2pp |
| 70 to 74 | 165 | 3.6% | 3.3% | 144 | 3.1% | 2.4% | +21 | +0.5pp |
| 75 to 79 | 170 | 3.7% | 2.2% | 161 | 3.4% | 1.8% | +9 | +0.3pp |
| 80 to 84 | 169 | 3.7% | 1.5% | 93 | 2.0% | 1.2% | +76 | +1.7pp |
| 85 and over | 64 | 1.4% | 1.3% | 45 | 1.0% | 1.0% | +19 | +0.4pp |
| Total | 4,623 | 100.0% | 100.0% | 4,674 | 100.0% | 100.0% | -51 | 0.0pp |