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 Bulgarra, accounting for 10.9% (326 people). This share was similar to Karratha (C) (10.8%). Since 2016, the biggest change was in 35 to 39 year olds, which increased by 75 people and 1.4 percentage points.
Section overview
Age structure - Five year age groups
Bulgarra - Total persons (Usual residence)
This table summarises five year age groups for Bulgarra in 2021 for persons, with comparison against Karratha (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Bulgarra, with comparison markers for Karratha (C).
0 to 4
2021 count
234
% of total
7.8%
Change from 2016
+0.2pp
234
7.8%
+0.2pp
5 to 9
2021 count
226
% of total
7.6%
Change from 2016
-0.1pp
226
7.6%
-0.1pp
10 to 14
2021 count
183
% of total
6.1%
Change from 2016
+0.6pp
183
6.1%
+0.6pp
15 to 19
2021 count
144
% of total
4.8%
Change from 2016
-0.4pp
144
4.8%
-0.4pp
20 to 24
2021 count
236
% of total
7.9%
Change from 2016
+1.2pp
236
7.9%
+1.2pp
25 to 29
2021 count
279
% of total
9.3%
Change from 2016
-0.9pp
279
9.3%
-0.9pp
30 to 34
2021 count
313
% of total
10.5%
Change from 2016
-1.7pp
313
10.5%
-1.7pp
35 to 39
2021 count
326
% of total
10.9%
Change from 2016
+1.4pp
326
10.9%
+1.4pp
40 to 44
2021 count
248
% of total
8.3%
Change from 2016
-1.0pp
248
8.3%
-1.0pp
45 to 49
2021 count
209
% of total
7.0%
Change from 2016
+0.5pp
209
7.0%
+0.5pp
50 to 54
2021 count
177
% of total
5.9%
Change from 2016
-1.0pp
177
5.9%
-1.0pp
55 to 59
2021 count
171
% of total
5.7%
Change from 2016
-0.2pp
171
5.7%
-0.2pp
60 to 64
2021 count
126
% of total
4.2%
Change from 2016
+0.5pp
126
4.2%
+0.5pp
65 to 69
2021 count
56
% of total
1.9%
Change from 2016
-0.4pp
56
1.9%
-0.4pp
70 to 74
2021 count
36
% of total
1.2%
Change from 2016
+0.7pp
36
1.2%
+0.7pp
75 to 79
2021 count
14
% of total
0.5%
Change from 2016
+0.5pp
14
0.5%
+0.5pp
80 to 84
2021 count
4
% of total
0.1%
Change from 2016
+0.1pp
4
0.1%
+0.1pp
85 and over
2021 count
0
% of total
0.0%
Change from 2016
0.0pp
0
0.0%
0.0pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+33
+0.2pp
5 to 9
+22
-0.1pp
10 to 14
+37
+0.6pp
15 to 19
+5
-0.4pp
20 to 24
+58
+1.2pp
25 to 29
+9
-0.9pp
30 to 34
-11
-1.7pp
35 to 39
+75
+1.4pp
40 to 44
+2
-1.0pp
45 to 49
+37
+0.5pp
50 to 54
-5
-1.0pp
55 to 59
+14
-0.2pp
60 to 64
+29
+0.5pp
65 to 69
-5
-0.4pp
70 to 74
+24
+0.7pp
75 to 79
+14
+0.5pp
80 to 84
+4
+0.1pp
85 and over
0
0.0pp
Data table
Five year age groups for Bulgarra. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Karratha (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Karratha (C)% | Count | % | Karratha (C)% | Count | pp | |
| 0 to 4 | 234 | 7.8% | 8.5% | 201 | 7.6% | 9.5% | +33 | +0.2pp |
| 5 to 9 | 226 | 7.6% | 9.2% | 204 | 7.7% | 8.6% | +22 | -0.1pp |
| 10 to 14 | 183 | 6.1% | 7.7% | 146 | 5.5% | 6.6% | +37 | +0.6pp |
| 15 to 19 | 144 | 4.8% | 5.4% | 139 | 5.2% | 5.1% | +5 | -0.4pp |
| 20 to 24 | 236 | 7.9% | 5.3% | 178 | 6.7% | 6.2% | +58 | +1.2pp |
| 25 to 29 | 279 | 9.3% | 8.1% | 270 | 10.2% | 9.6% | +9 | -0.9pp |
| 30 to 34 | 313 | 10.5% | 10.4% | 324 | 12.2% | 11.7% | -11 | -1.7pp |
| 35 to 39 | 326 | 10.9% | 10.8% | 251 | 9.5% | 9.6% | +75 | +1.4pp |
| 40 to 44 | 248 | 8.3% | 8.7% | 246 | 9.3% | 9.0% | +2 | -1.0pp |
| 45 to 49 | 209 | 7.0% | 7.9% | 172 | 6.5% | 7.7% | +37 | +0.5pp |
| 50 to 54 | 177 | 5.9% | 6.3% | 182 | 6.9% | 6.3% | -5 | -1.0pp |
| 55 to 59 | 171 | 5.7% | 4.8% | 157 | 5.9% | 4.7% | +14 | -0.2pp |
| 60 to 64 | 126 | 4.2% | 3.6% | 97 | 3.7% | 2.9% | +29 | +0.5pp |
| 65 to 69 | 56 | 1.9% | 1.7% | 61 | 2.3% | 1.4% | -5 | -0.4pp |
| 70 to 74 | 36 | 1.2% | 0.9% | 12 | 0.5% | 0.6% | +24 | +0.7pp |
| 75 to 79 | 14 | 0.5% | 0.3% | 0 | 0.0% | 0.3% | +14 | +0.5pp |
| 80 to 84 | 4 | 0.1% | 0.3% | 0 | 0.0% | 0.1% | +4 | +0.1pp |
| 85 and over | 0 | 0.0% | 0.0% | 0 | 0.0% | 0.1% | 0 | 0.0pp |
| Total | 2,990 | 100.0% | 100.0% | 2,652 | 100.0% | 100.0% | +338 | 0.0pp |