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 Riverstone, accounting for 9.7% (835 people). This share was higher than Blacktown (C) (7.9%). Since 2016, the biggest change was in 30 to 34 year olds, which increased by 835 people and 9.7 percentage points.
Section overview
Age structure - Five year age groups
Riverstone - Total persons (Usual residence)
This table summarises five year age groups for Riverstone 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 Riverstone, with comparison markers for Blacktown (C).
0 to 4
2021 count
822
% of total
9.5%
Change from 2016
+3.7pp
822
9.5%
+3.7pp
5 to 9
2021 count
686
% of total
8.0%
Change from 2016
-3.5pp
686
8.0%
-3.5pp
10 to 14
2021 count
577
% of total
6.7%
Change from 2016
+0.9pp
577
6.7%
+0.9pp
15 to 19
2021 count
479
% of total
5.6%
Change from 2016
+5.6pp
479
5.6%
+5.6pp
20 to 24
2021 count
591
% of total
6.9%
Change from 2016
+6.9pp
591
6.9%
+6.9pp
25 to 29
2021 count
721
% of total
8.4%
Change from 2016
+8.4pp
721
8.4%
+8.4pp
30 to 34
2021 count
835
% of total
9.7%
Change from 2016
+9.7pp
835
9.7%
+9.7pp
35 to 39
2021 count
783
% of total
9.1%
Change from 2016
+1.4pp
783
9.1%
+1.4pp
40 to 44
2021 count
620
% of total
7.2%
Change from 2016
+1.4pp
620
7.2%
+1.4pp
45 to 49
2021 count
518
% of total
6.0%
Change from 2016
+6.0pp
518
6.0%
+6.0pp
50 to 54
2021 count
453
% of total
5.3%
Change from 2016
+5.3pp
453
5.3%
+5.3pp
55 to 59
2021 count
397
% of total
4.6%
Change from 2016
-1.2pp
397
4.6%
-1.2pp
60 to 64
2021 count
337
% of total
3.9%
Change from 2016
-1.9pp
337
3.9%
-1.9pp
65 to 69
2021 count
272
% of total
3.2%
Change from 2016
-2.6pp
272
3.2%
-2.6pp
70 to 74
2021 count
237
% of total
2.7%
Change from 2016
+2.7pp
237
2.7%
+2.7pp
75 to 79
2021 count
155
% of total
1.8%
Change from 2016
+1.8pp
155
1.8%
+1.8pp
80 to 84
2021 count
89
% of total
1.0%
Change from 2016
-4.8pp
89
1.0%
-4.8pp
85 and over
2021 count
85
% of total
1.0%
Change from 2016
-4.8pp
85
1.0%
-4.8pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+819
+3.7pp
5 to 9
+680
-3.5pp
10 to 14
+574
+0.9pp
15 to 19
+479
+5.6pp
20 to 24
+591
+6.9pp
25 to 29
+721
+8.4pp
30 to 34
+835
+9.7pp
35 to 39
+779
+1.4pp
40 to 44
+617
+1.4pp
45 to 49
+518
+6.0pp
50 to 54
+453
+5.3pp
55 to 59
+394
-1.2pp
60 to 64
+334
-1.9pp
65 to 69
+269
-2.6pp
70 to 74
+237
+2.7pp
75 to 79
+155
+1.8pp
80 to 84
+86
-4.8pp
85 and over
+82
-4.8pp
Data table
Five year age groups for Riverstone. 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 | 822 | 9.5% | 7.5% | 3 | 5.8% | 8.0% | +819 | +3.7pp |
| 5 to 9 | 686 | 8.0% | 7.9% | 6 | 11.5% | 7.9% | +680 | -3.5pp |
| 10 to 14 | 577 | 6.7% | 7.3% | 3 | 5.8% | 6.9% | +574 | +0.9pp |
| 15 to 19 | 479 | 5.6% | 6.1% | 0 | 0.0% | 6.9% | +479 | +5.6pp |
| 20 to 24 | 591 | 6.9% | 6.7% | 0 | 0.0% | 6.8% | +591 | +6.9pp |
| 25 to 29 | 721 | 8.4% | 7.0% | 0 | 0.0% | 7.2% | +721 | +8.4pp |
| 30 to 34 | 835 | 9.7% | 7.9% | 0 | 0.0% | 8.3% | +835 | +9.7pp |
| 35 to 39 | 783 | 9.1% | 9.2% | 4 | 7.7% | 8.1% | +779 | +1.4pp |
| 40 to 44 | 620 | 7.2% | 7.8% | 3 | 5.8% | 7.2% | +617 | +1.4pp |
| 45 to 49 | 518 | 6.0% | 6.4% | 0 | 0.0% | 6.5% | +518 | +6.0pp |
| 50 to 54 | 453 | 5.3% | 5.6% | 0 | 0.0% | 6.0% | +453 | +5.3pp |
| 55 to 59 | 397 | 4.6% | 5.1% | 3 | 5.8% | 5.4% | +394 | -1.2pp |
| 60 to 64 | 337 | 3.9% | 4.5% | 3 | 5.8% | 4.6% | +334 | -1.9pp |
| 65 to 69 | 272 | 3.2% | 3.7% | 3 | 5.8% | 3.8% | +269 | -2.6pp |
| 70 to 74 | 237 | 2.7% | 3.1% | 0 | 0.0% | 2.5% | +237 | +2.7pp |
| 75 to 79 | 155 | 1.8% | 1.9% | 0 | 0.0% | 1.7% | +155 | +1.8pp |
| 80 to 84 | 89 | 1.0% | 1.2% | 3 | 5.8% | 1.1% | +86 | -4.8pp |
| 85 and over | 85 | 1.0% | 1.1% | 3 | 5.8% | 1.1% | +82 | -4.8pp |
| Total | 8,627 | 100.0% | 100.0% | 52 | 100.0% | 100.0% | +8,575 | 0.0pp |