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, 5 to 9 year olds was the largest age group among residents in Blackett, accounting for 9.2% (329 people). This share was higher than Blacktown (C) (7.9%). Since 2016, the biggest change was in 65 to 69 year olds, which decreased by 69 people and 2.1 percentage points.
Section overview
Age structure - Five year age groups
Blackett - Total persons (Usual residence)
This table summarises five year age groups for Blackett in 2021 for persons, with comparison against Blacktown (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Blackett, with comparison markers for Blacktown (C).
0 to 4
2021 count
289
% of total
8.1%
Change from 2016
-1.7pp
289
8.1%
-1.7pp
5 to 9
2021 count
329
% of total
9.2%
Change from 2016
+0.3pp
329
9.2%
+0.3pp
10 to 14
2021 count
305
% of total
8.5%
Change from 2016
+0.9pp
305
8.5%
+0.9pp
15 to 19
2021 count
264
% of total
7.4%
Change from 2016
-1.2pp
264
7.4%
-1.2pp
20 to 24
2021 count
271
% of total
7.6%
Change from 2016
+0.6pp
271
7.6%
+0.6pp
25 to 29
2021 count
271
% of total
7.6%
Change from 2016
+0.8pp
271
7.6%
+0.8pp
30 to 34
2021 count
232
% of total
6.5%
Change from 2016
+0.7pp
232
6.5%
+0.7pp
35 to 39
2021 count
221
% of total
6.2%
Change from 2016
+0.4pp
221
6.2%
+0.4pp
40 to 44
2021 count
194
% of total
5.4%
Change from 2016
-0.4pp
194
5.4%
-0.4pp
45 to 49
2021 count
210
% of total
5.9%
Change from 2016
-0.6pp
210
5.9%
-0.6pp
50 to 54
2021 count
200
% of total
5.6%
Change from 2016
+0.2pp
200
5.6%
+0.2pp
55 to 59
2021 count
184
% of total
5.1%
Change from 2016
0.0pp
184
5.1%
0.0pp
60 to 64
2021 count
165
% of total
4.6%
Change from 2016
+1.2pp
165
4.6%
+1.2pp
65 to 69
2021 count
119
% of total
3.3%
Change from 2016
-2.1pp
119
3.3%
-2.1pp
70 to 74
2021 count
140
% of total
3.9%
Change from 2016
+0.1pp
140
3.9%
+0.1pp
75 to 79
2021 count
105
% of total
2.9%
Change from 2016
+0.2pp
105
2.9%
+0.2pp
80 to 84
2021 count
76
% of total
2.1%
Change from 2016
+0.9pp
76
2.1%
+0.9pp
85 and over
2021 count
23
% of total
0.6%
Change from 2016
0.0pp
23
0.6%
0.0pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-51
-1.7pp
5 to 9
+21
+0.3pp
10 to 14
+41
+0.9pp
15 to 19
-32
-1.2pp
20 to 24
+30
+0.6pp
25 to 29
+36
+0.8pp
30 to 34
+32
+0.7pp
35 to 39
+22
+0.4pp
40 to 44
-5
-0.4pp
45 to 49
-15
-0.6pp
50 to 54
+13
+0.2pp
55 to 59
+9
0.0pp
60 to 64
+48
+1.2pp
65 to 69
-69
-2.1pp
70 to 74
+8
+0.1pp
75 to 79
+12
+0.2pp
80 to 84
+33
+0.9pp
85 and over
+1
0.0pp
Data table
Five year age groups for Blackett. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Blacktown (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Blacktown (C)% | Count | % | Blacktown (C)% | Count | pp | |
| 0 to 4 | 289 | 8.1% | 7.5% | 340 | 9.8% | 8.0% | -51 | -1.7pp |
| 5 to 9 | 329 | 9.2% | 7.9% | 308 | 8.9% | 7.9% | +21 | +0.3pp |
| 10 to 14 | 305 | 8.5% | 7.3% | 264 | 7.6% | 6.9% | +41 | +0.9pp |
| 15 to 19 | 264 | 7.4% | 6.1% | 296 | 8.6% | 6.9% | -32 | -1.2pp |
| 20 to 24 | 271 | 7.6% | 6.7% | 241 | 7.0% | 6.8% | +30 | +0.6pp |
| 25 to 29 | 271 | 7.6% | 7.0% | 235 | 6.8% | 7.2% | +36 | +0.8pp |
| 30 to 34 | 232 | 6.5% | 7.9% | 200 | 5.8% | 8.3% | +32 | +0.7pp |
| 35 to 39 | 221 | 6.2% | 9.2% | 199 | 5.8% | 8.1% | +22 | +0.4pp |
| 40 to 44 | 194 | 5.4% | 7.8% | 199 | 5.8% | 7.2% | -5 | -0.4pp |
| 45 to 49 | 210 | 5.9% | 6.4% | 225 | 6.5% | 6.5% | -15 | -0.6pp |
| 50 to 54 | 200 | 5.6% | 5.6% | 187 | 5.4% | 6.0% | +13 | +0.2pp |
| 55 to 59 | 184 | 5.1% | 5.1% | 175 | 5.1% | 5.4% | +9 | 0.0pp |
| 60 to 64 | 165 | 4.6% | 4.5% | 117 | 3.4% | 4.6% | +48 | +1.2pp |
| 65 to 69 | 119 | 3.3% | 3.7% | 188 | 5.4% | 3.8% | -69 | -2.1pp |
| 70 to 74 | 140 | 3.9% | 3.1% | 132 | 3.8% | 2.5% | +8 | +0.1pp |
| 75 to 79 | 105 | 2.9% | 1.9% | 93 | 2.7% | 1.7% | +12 | +0.2pp |
| 80 to 84 | 76 | 2.1% | 1.2% | 43 | 1.2% | 1.1% | +33 | +0.9pp |
| 85 and over | 23 | 0.6% | 1.1% | 22 | 0.6% | 1.1% | +1 | 0.0pp |
| Total | 3,586 | 100.0% | 100.0% | 3,452 | 100.0% | 100.0% | +134 | 0.0pp |