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, 20 to 24 year olds was the largest age group among residents in Oakhurst (NSW), accounting for 7.8% (544 people). This share was higher than Blacktown (C) (6.7%). Since 2016, the biggest change was in 15 to 19 year olds, which decreased by 111 people and 1.5 percentage points.
Section overview
Age structure - Five year age groups
Oakhurst (NSW) - Total persons (Usual residence)
This table summarises five year age groups for Oakhurst (NSW) 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 Oakhurst (NSW), with comparison markers for Blacktown (C).
0 to 4
2021 count
431
% of total
6.2%
Change from 2016
-0.8pp
431
6.2%
-0.8pp
5 to 9
2021 count
501
% of total
7.2%
Change from 2016
-0.4pp
501
7.2%
-0.4pp
10 to 14
2021 count
531
% of total
7.6%
Change from 2016
-0.2pp
531
7.6%
-0.2pp
15 to 19
2021 count
504
% of total
7.3%
Change from 2016
-1.5pp
504
7.3%
-1.5pp
20 to 24
2021 count
544
% of total
7.8%
Change from 2016
-0.6pp
544
7.8%
-0.6pp
25 to 29
2021 count
534
% of total
7.7%
Change from 2016
+0.4pp
534
7.7%
+0.4pp
30 to 34
2021 count
463
% of total
6.7%
Change from 2016
-0.4pp
463
6.7%
-0.4pp
35 to 39
2021 count
475
% of total
6.8%
Change from 2016
+0.6pp
475
6.8%
+0.6pp
40 to 44
2021 count
428
% of total
6.2%
Change from 2016
-1.2pp
428
6.2%
-1.2pp
45 to 49
2021 count
507
% of total
7.3%
Change from 2016
+0.3pp
507
7.3%
+0.3pp
50 to 54
2021 count
473
% of total
6.8%
Change from 2016
-0.8pp
473
6.8%
-0.8pp
55 to 59
2021 count
465
% of total
6.7%
Change from 2016
+0.3pp
465
6.7%
+0.3pp
60 to 64
2021 count
414
% of total
6.0%
Change from 2016
+1.4pp
414
6.0%
+1.4pp
65 to 69
2021 count
282
% of total
4.1%
Change from 2016
+1.0pp
282
4.1%
+1.0pp
70 to 74
2021 count
208
% of total
3.0%
Change from 2016
+1.4pp
208
3.0%
+1.4pp
75 to 79
2021 count
102
% of total
1.5%
Change from 2016
+0.5pp
102
1.5%
+0.5pp
80 to 84
2021 count
49
% of total
0.7%
Change from 2016
0.0pp
49
0.7%
0.0pp
85 and over
2021 count
41
% of total
0.6%
Change from 2016
+0.2pp
41
0.6%
+0.2pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-54
-0.8pp
5 to 9
-28
-0.4pp
10 to 14
-12
-0.2pp
15 to 19
-111
-1.5pp
20 to 24
-41
-0.6pp
25 to 29
+26
+0.4pp
30 to 34
-32
-0.4pp
35 to 39
+46
+0.6pp
40 to 44
-90
-1.2pp
45 to 49
+22
+0.3pp
50 to 54
-57
-0.8pp
55 to 59
+17
+0.3pp
60 to 64
+95
+1.4pp
65 to 69
+67
+1.0pp
70 to 74
+95
+1.4pp
75 to 79
+29
+0.5pp
80 to 84
-2
0.0pp
85 and over
+16
+0.2pp
Data table
Five year age groups for Oakhurst (NSW). 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 | 431 | 6.2% | 7.5% | 485 | 7.0% | 8.0% | -54 | -0.8pp |
| 5 to 9 | 501 | 7.2% | 7.9% | 529 | 7.6% | 7.9% | -28 | -0.4pp |
| 10 to 14 | 531 | 7.6% | 7.3% | 543 | 7.8% | 6.9% | -12 | -0.2pp |
| 15 to 19 | 504 | 7.3% | 6.1% | 615 | 8.8% | 6.9% | -111 | -1.5pp |
| 20 to 24 | 544 | 7.8% | 6.7% | 585 | 8.4% | 6.8% | -41 | -0.6pp |
| 25 to 29 | 534 | 7.7% | 7.0% | 508 | 7.3% | 7.2% | +26 | +0.4pp |
| 30 to 34 | 463 | 6.7% | 7.9% | 495 | 7.1% | 8.3% | -32 | -0.4pp |
| 35 to 39 | 475 | 6.8% | 9.2% | 429 | 6.2% | 8.1% | +46 | +0.6pp |
| 40 to 44 | 428 | 6.2% | 7.8% | 518 | 7.4% | 7.2% | -90 | -1.2pp |
| 45 to 49 | 507 | 7.3% | 6.4% | 485 | 7.0% | 6.5% | +22 | +0.3pp |
| 50 to 54 | 473 | 6.8% | 5.6% | 530 | 7.6% | 6.0% | -57 | -0.8pp |
| 55 to 59 | 465 | 6.7% | 5.1% | 448 | 6.4% | 5.4% | +17 | +0.3pp |
| 60 to 64 | 414 | 6.0% | 4.5% | 319 | 4.6% | 4.6% | +95 | +1.4pp |
| 65 to 69 | 282 | 4.1% | 3.7% | 215 | 3.1% | 3.8% | +67 | +1.0pp |
| 70 to 74 | 208 | 3.0% | 3.1% | 113 | 1.6% | 2.5% | +95 | +1.4pp |
| 75 to 79 | 102 | 1.5% | 1.9% | 73 | 1.0% | 1.7% | +29 | +0.5pp |
| 80 to 84 | 49 | 0.7% | 1.2% | 51 | 0.7% | 1.1% | -2 | 0.0pp |
| 85 and over | 41 | 0.6% | 1.1% | 25 | 0.4% | 1.1% | +16 | +0.2pp |
| Total | 6,947 | 100.0% | 100.0% | 6,955 | 100.0% | 100.0% | -8 | 0.0pp |