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 Marsden Park, accounting for 15.3% (2,231 people). This share was higher than Blacktown (C) (9.2%). Since 2016, the biggest change was in 35 to 39 year olds, which increased by 2,170 people and 8.6 percentage points.
Section overview
Age structure - Five year age groups
Marsden Park - Total persons (Usual residence)
This table summarises five year age groups for Marsden Park 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 Marsden Park, with comparison markers for Blacktown (C).
0 to 4
2021 count
1,712
% of total
11.7%
Change from 2016
+5.1pp
1,712
11.7%
+5.1pp
5 to 9
2021 count
1,612
% of total
11.0%
Change from 2016
+6.0pp
1,612
11.0%
+6.0pp
10 to 14
2021 count
1,077
% of total
7.4%
Change from 2016
+2.4pp
1,077
7.4%
+2.4pp
15 to 19
2021 count
645
% of total
4.4%
Change from 2016
-0.8pp
645
4.4%
-0.8pp
20 to 24
2021 count
600
% of total
4.1%
Change from 2016
-2.6pp
600
4.1%
-2.6pp
25 to 29
2021 count
991
% of total
6.8%
Change from 2016
+1.8pp
991
6.8%
+1.8pp
30 to 34
2021 count
1,702
% of total
11.6%
Change from 2016
+1.3pp
1,702
11.6%
+1.3pp
35 to 39
2021 count
2,231
% of total
15.3%
Change from 2016
+8.6pp
2,231
15.3%
+8.6pp
40 to 44
2021 count
1,362
% of total
9.3%
Change from 2016
+3.9pp
1,362
9.3%
+3.9pp
45 to 49
2021 count
726
% of total
5.0%
Change from 2016
+0.1pp
726
5.0%
+0.1pp
50 to 54
2021 count
421
% of total
2.9%
Change from 2016
-1.6pp
421
2.9%
-1.6pp
55 to 59
2021 count
352
% of total
2.4%
Change from 2016
-3.9pp
352
2.4%
-3.9pp
60 to 64
2021 count
343
% of total
2.3%
Change from 2016
-5.2pp
343
2.3%
-5.2pp
65 to 69
2021 count
332
% of total
2.3%
Change from 2016
-6.9pp
332
2.3%
-6.9pp
70 to 74
2021 count
249
% of total
1.7%
Change from 2016
-4.1pp
249
1.7%
-4.1pp
75 to 79
2021 count
135
% of total
0.9%
Change from 2016
-3.5pp
135
0.9%
-3.5pp
80 to 84
2021 count
96
% of total
0.7%
Change from 2016
-0.3pp
96
0.7%
-0.3pp
85 and over
2021 count
26
% of total
0.2%
Change from 2016
-0.7pp
26
0.2%
-0.7pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+1,652
+5.1pp
5 to 9
+1,566
+6.0pp
10 to 14
+1,032
+2.4pp
15 to 19
+598
-0.8pp
20 to 24
+539
-2.6pp
25 to 29
+946
+1.8pp
30 to 34
+1,609
+1.3pp
35 to 39
+2,170
+8.6pp
40 to 44
+1,313
+3.9pp
45 to 49
+681
+0.1pp
50 to 54
+380
-1.6pp
55 to 59
+295
-3.9pp
60 to 64
+275
-5.2pp
65 to 69
+248
-6.9pp
70 to 74
+196
-4.1pp
75 to 79
+95
-3.5pp
80 to 84
+87
-0.3pp
85 and over
+18
-0.7pp
Data table
Five year age groups for Marsden Park. 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 | 1,712 | 11.7% | 7.5% | 60 | 6.6% | 8.0% | +1,652 | +5.1pp |
| 5 to 9 | 1,612 | 11.0% | 7.9% | 46 | 5.0% | 7.9% | +1,566 | +6.0pp |
| 10 to 14 | 1,077 | 7.4% | 7.3% | 45 | 5.0% | 6.9% | +1,032 | +2.4pp |
| 15 to 19 | 645 | 4.4% | 6.1% | 47 | 5.2% | 6.9% | +598 | -0.8pp |
| 20 to 24 | 600 | 4.1% | 6.7% | 61 | 6.7% | 6.8% | +539 | -2.6pp |
| 25 to 29 | 991 | 6.8% | 7.0% | 45 | 5.0% | 7.2% | +946 | +1.8pp |
| 30 to 34 | 1,702 | 11.6% | 7.9% | 93 | 10.3% | 8.3% | +1,609 | +1.3pp |
| 35 to 39 | 2,231 | 15.3% | 9.2% | 61 | 6.7% | 8.1% | +2,170 | +8.6pp |
| 40 to 44 | 1,362 | 9.3% | 7.8% | 49 | 5.4% | 7.2% | +1,313 | +3.9pp |
| 45 to 49 | 726 | 5.0% | 6.4% | 45 | 4.9% | 6.5% | +681 | +0.1pp |
| 50 to 54 | 421 | 2.9% | 5.6% | 41 | 4.5% | 6.0% | +380 | -1.6pp |
| 55 to 59 | 352 | 2.4% | 5.1% | 57 | 6.3% | 5.4% | +295 | -3.9pp |
| 60 to 64 | 343 | 2.3% | 4.5% | 68 | 7.5% | 4.6% | +275 | -5.2pp |
| 65 to 69 | 332 | 2.3% | 3.7% | 84 | 9.2% | 3.8% | +248 | -6.9pp |
| 70 to 74 | 249 | 1.7% | 3.1% | 53 | 5.8% | 2.5% | +196 | -4.1pp |
| 75 to 79 | 135 | 0.9% | 1.9% | 40 | 4.4% | 1.7% | +95 | -3.5pp |
| 80 to 84 | 96 | 0.7% | 1.2% | 9 | 1.0% | 1.1% | +87 | -0.3pp |
| 85 and over | 26 | 0.2% | 1.1% | 8 | 0.9% | 1.1% | +18 | -0.7pp |
| Total | 14,610 | 100.0% | 100.0% | 909 | 100.0% | 100.0% | +13,701 | 0.0pp |