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 Doonside, accounting for 7.5% (1,019 people). This share was lower than Blacktown (C) (9.2%). Since 2016, the biggest change was in 35 to 39 year olds, which increased by 940 people and 2.7 percentage points.
Section overview
Age structure - Five year age groups
Doonside - Total persons (Usual residence)
This table summarises five year age groups for Doonside 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 Doonside, with comparison markers for Blacktown (C).
0 to 4
2021 count
813
% of total
6.0%
Change from 2016
+1.1pp
813
6.0%
+1.1pp
5 to 9
2021 count
852
% of total
6.3%
Change from 2016
+1.9pp
852
6.3%
+1.9pp
10 to 14
2021 count
948
% of total
7.0%
Change from 2016
+3.2pp
948
7.0%
+3.2pp
15 to 19
2021 count
855
% of total
6.3%
Change from 2016
+0.3pp
855
6.3%
+0.3pp
20 to 24
2021 count
945
% of total
6.9%
Change from 2016
+2.6pp
945
6.9%
+2.6pp
25 to 29
2021 count
1,010
% of total
7.4%
Change from 2016
+1.4pp
1,010
7.4%
+1.4pp
30 to 34
2021 count
997
% of total
7.3%
Change from 2016
+2.4pp
997
7.3%
+2.4pp
35 to 39
2021 count
1,019
% of total
7.5%
Change from 2016
+2.7pp
1,019
7.5%
+2.7pp
40 to 44
2021 count
874
% of total
6.4%
Change from 2016
+2.1pp
874
6.4%
+2.1pp
45 to 49
2021 count
866
% of total
6.4%
Change from 2016
+1.0pp
866
6.4%
+1.0pp
50 to 54
2021 count
895
% of total
6.6%
Change from 2016
-0.5pp
895
6.6%
-0.5pp
55 to 59
2021 count
778
% of total
5.7%
Change from 2016
-2.9pp
778
5.7%
-2.9pp
60 to 64
2021 count
828
% of total
6.1%
Change from 2016
-1.8pp
828
6.1%
-1.8pp
65 to 69
2021 count
665
% of total
4.9%
Change from 2016
-2.0pp
665
4.9%
-2.0pp
70 to 74
2021 count
578
% of total
4.2%
Change from 2016
-2.7pp
578
4.2%
-2.7pp
75 to 79
2021 count
352
% of total
2.6%
Change from 2016
-2.9pp
352
2.6%
-2.9pp
80 to 84
2021 count
183
% of total
1.3%
Change from 2016
-3.0pp
183
1.3%
-3.0pp
85 and over
2021 count
163
% of total
1.2%
Change from 2016
-1.7pp
163
1.2%
-1.7pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+733
+1.1pp
5 to 9
+779
+1.9pp
10 to 14
+885
+3.2pp
15 to 19
+756
+0.3pp
20 to 24
+875
+2.6pp
25 to 29
+911
+1.4pp
30 to 34
+916
+2.4pp
35 to 39
+940
+2.7pp
40 to 44
+803
+2.1pp
45 to 49
+778
+1.0pp
50 to 54
+779
-0.5pp
55 to 59
+637
-2.9pp
60 to 64
+698
-1.8pp
65 to 69
+551
-2.0pp
70 to 74
+464
-2.7pp
75 to 79
+262
-2.9pp
80 to 84
+112
-3.0pp
85 and over
+116
-1.7pp
Data table
Five year age groups for Doonside. 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 | 813 | 6.0% | 7.5% | 80 | 4.9% | 8.0% | +733 | +1.1pp |
| 5 to 9 | 852 | 6.3% | 7.9% | 73 | 4.4% | 7.9% | +779 | +1.9pp |
| 10 to 14 | 948 | 7.0% | 7.3% | 63 | 3.8% | 6.9% | +885 | +3.2pp |
| 15 to 19 | 855 | 6.3% | 6.1% | 99 | 6.0% | 6.9% | +756 | +0.3pp |
| 20 to 24 | 945 | 6.9% | 6.7% | 70 | 4.3% | 6.8% | +875 | +2.6pp |
| 25 to 29 | 1,010 | 7.4% | 7.0% | 99 | 6.0% | 7.2% | +911 | +1.4pp |
| 30 to 34 | 997 | 7.3% | 7.9% | 81 | 4.9% | 8.3% | +916 | +2.4pp |
| 35 to 39 | 1,019 | 7.5% | 9.2% | 79 | 4.8% | 8.1% | +940 | +2.7pp |
| 40 to 44 | 874 | 6.4% | 7.8% | 71 | 4.3% | 7.2% | +803 | +2.1pp |
| 45 to 49 | 866 | 6.4% | 6.4% | 88 | 5.4% | 6.5% | +778 | +1.0pp |
| 50 to 54 | 895 | 6.6% | 5.6% | 116 | 7.1% | 6.0% | +779 | -0.5pp |
| 55 to 59 | 778 | 5.7% | 5.1% | 141 | 8.6% | 5.4% | +637 | -2.9pp |
| 60 to 64 | 828 | 6.1% | 4.5% | 130 | 7.9% | 4.6% | +698 | -1.8pp |
| 65 to 69 | 665 | 4.9% | 3.7% | 114 | 6.9% | 3.8% | +551 | -2.0pp |
| 70 to 74 | 578 | 4.2% | 3.1% | 114 | 6.9% | 2.5% | +464 | -2.7pp |
| 75 to 79 | 352 | 2.6% | 1.9% | 90 | 5.5% | 1.7% | +262 | -2.9pp |
| 80 to 84 | 183 | 1.3% | 1.2% | 71 | 4.3% | 1.1% | +112 | -3.0pp |
| 85 and over | 163 | 1.2% | 1.1% | 47 | 2.9% | 1.1% | +116 | -1.7pp |
| Total | 13,614 | 100.0% | 100.0% | 1,643 | 100.0% | 100.0% | +11,971 | 0.0pp |