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, 30 to 34 year olds was the largest age group among residents in Millars Well, accounting for 11.1% (233 people). This share was higher than Karratha (C) (10.4%). Since 2016, the biggest change was in 35 to 39 year olds, which increased by 60 people and 1.6 percentage points.
Section overview
Age structure - Five year age groups
Millars Well - Total persons (Usual residence)
This table summarises five year age groups for Millars Well 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 Millars Well, with comparison markers for Karratha (C).
0 to 4
2021 count
212
% of total
10.1%
Change from 2016
-0.6pp
212
10.1%
-0.6pp
5 to 9
2021 count
199
% of total
9.5%
Change from 2016
+0.9pp
199
9.5%
+0.9pp
10 to 14
2021 count
166
% of total
7.9%
Change from 2016
+1.9pp
166
7.9%
+1.9pp
15 to 19
2021 count
87
% of total
4.1%
Change from 2016
-0.7pp
87
4.1%
-0.7pp
20 to 24
2021 count
129
% of total
6.1%
Change from 2016
-1.3pp
129
6.1%
-1.3pp
25 to 29
2021 count
202
% of total
9.6%
Change from 2016
-1.2pp
202
9.6%
-1.2pp
30 to 34
2021 count
233
% of total
11.1%
Change from 2016
+1.4pp
233
11.1%
+1.4pp
35 to 39
2021 count
233
% of total
11.1%
Change from 2016
+1.6pp
233
11.1%
+1.6pp
40 to 44
2021 count
174
% of total
8.3%
Change from 2016
+0.3pp
174
8.3%
+0.3pp
45 to 49
2021 count
118
% of total
5.6%
Change from 2016
-1.1pp
118
5.6%
-1.1pp
50 to 54
2021 count
108
% of total
5.1%
Change from 2016
-0.7pp
108
5.1%
-0.7pp
55 to 59
2021 count
95
% of total
4.5%
Change from 2016
-0.6pp
95
4.5%
-0.6pp
60 to 64
2021 count
73
% of total
3.5%
Change from 2016
+0.4pp
73
3.5%
+0.4pp
65 to 69
2021 count
46
% of total
2.2%
Change from 2016
+0.5pp
46
2.2%
+0.5pp
70 to 74
2021 count
15
% of total
0.7%
Change from 2016
+0.5pp
15
0.7%
+0.5pp
75 to 79
2021 count
0
% of total
0.0%
Change from 2016
-0.2pp
0
0.0%
-0.2pp
80 to 84
2021 count
6
% of total
0.3%
Change from 2016
+0.1pp
6
0.3%
+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
+16
-0.6pp
5 to 9
+42
+0.9pp
10 to 14
+57
+1.9pp
15 to 19
-1
-0.7pp
20 to 24
-6
-1.3pp
25 to 29
+4
-1.2pp
30 to 34
+56
+1.4pp
35 to 39
+60
+1.6pp
40 to 44
+27
+0.3pp
45 to 49
-4
-1.1pp
50 to 54
+2
-0.7pp
55 to 59
+2
-0.6pp
60 to 64
+16
+0.4pp
65 to 69
+15
+0.5pp
70 to 74
+12
+0.5pp
75 to 79
-3
-0.2pp
80 to 84
+3
+0.1pp
85 and over
0
0.0pp
Data table
Five year age groups for Millars Well. 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 | 212 | 10.1% | 8.5% | 196 | 10.7% | 9.5% | +16 | -0.6pp |
| 5 to 9 | 199 | 9.5% | 9.2% | 157 | 8.6% | 8.6% | +42 | +0.9pp |
| 10 to 14 | 166 | 7.9% | 7.7% | 109 | 6.0% | 6.6% | +57 | +1.9pp |
| 15 to 19 | 87 | 4.1% | 5.4% | 88 | 4.8% | 5.1% | -1 | -0.7pp |
| 20 to 24 | 129 | 6.1% | 5.3% | 135 | 7.4% | 6.2% | -6 | -1.3pp |
| 25 to 29 | 202 | 9.6% | 8.1% | 198 | 10.8% | 9.6% | +4 | -1.2pp |
| 30 to 34 | 233 | 11.1% | 10.4% | 177 | 9.7% | 11.7% | +56 | +1.4pp |
| 35 to 39 | 233 | 11.1% | 10.8% | 173 | 9.5% | 9.6% | +60 | +1.6pp |
| 40 to 44 | 174 | 8.3% | 8.7% | 147 | 8.0% | 9.0% | +27 | +0.3pp |
| 45 to 49 | 118 | 5.6% | 7.9% | 122 | 6.7% | 7.7% | -4 | -1.1pp |
| 50 to 54 | 108 | 5.1% | 6.3% | 106 | 5.8% | 6.3% | +2 | -0.7pp |
| 55 to 59 | 95 | 4.5% | 4.8% | 93 | 5.1% | 4.7% | +2 | -0.6pp |
| 60 to 64 | 73 | 3.5% | 3.6% | 57 | 3.1% | 2.9% | +16 | +0.4pp |
| 65 to 69 | 46 | 2.2% | 1.7% | 31 | 1.7% | 1.4% | +15 | +0.5pp |
| 70 to 74 | 15 | 0.7% | 0.9% | 3 | 0.2% | 0.6% | +12 | +0.5pp |
| 75 to 79 | 0 | 0.0% | 0.3% | 3 | 0.2% | 0.3% | -3 | -0.2pp |
| 80 to 84 | 6 | 0.3% | 0.3% | 3 | 0.2% | 0.1% | +3 | +0.1pp |
| 85 and over | 0 | 0.0% | 0.0% | 0 | 0.0% | 0.1% | 0 | 0.0pp |
| Total | 2,104 | 100.0% | 100.0% | 1,828 | 100.0% | 100.0% | +276 | 0.0pp |