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, 25 to 29 year olds was the largest age group among residents in Petersham, accounting for 11.2% (917 people). This share was higher than Inner West (A) (9.4%). Since 2016, the biggest change was in 25 to 29 year olds, which increased by 907 people and 8.1 percentage points.
Section overview
Age structure - Five year age groups
Petersham - Total persons (Usual residence)
This table summarises five year age groups for Petersham in 2021 for persons, with comparison against Inner West (A) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Petersham, with comparison markers for Inner West (A).
0 to 4
2021 count
339
% of total
4.1%
Change from 2016
-3.0pp
339
4.1%
-3.0pp
5 to 9
2021 count
335
% of total
4.1%
Change from 2016
-2.4pp
335
4.1%
-2.4pp
10 to 14
2021 count
367
% of total
4.5%
Change from 2016
-3.3pp
367
4.5%
-3.3pp
15 to 19
2021 count
367
% of total
4.5%
Change from 2016
-3.6pp
367
4.5%
-3.6pp
20 to 24
2021 count
601
% of total
7.3%
Change from 2016
+2.6pp
601
7.3%
+2.6pp
25 to 29
2021 count
917
% of total
11.2%
Change from 2016
+8.1pp
917
11.2%
+8.1pp
30 to 34
2021 count
888
% of total
10.8%
Change from 2016
+4.6pp
888
10.8%
+4.6pp
35 to 39
2021 count
750
% of total
9.1%
Change from 2016
+3.8pp
750
9.1%
+3.8pp
40 to 44
2021 count
621
% of total
7.6%
Change from 2016
-2.3pp
621
7.6%
-2.3pp
45 to 49
2021 count
596
% of total
7.3%
Change from 2016
+1.4pp
596
7.3%
+1.4pp
50 to 54
2021 count
620
% of total
7.6%
Change from 2016
-2.0pp
620
7.6%
-2.0pp
55 to 59
2021 count
452
% of total
5.5%
Change from 2016
-0.7pp
452
5.5%
-0.7pp
60 to 64
2021 count
369
% of total
4.5%
Change from 2016
-1.1pp
369
4.5%
-1.1pp
65 to 69
2021 count
324
% of total
4.0%
Change from 2016
-3.1pp
324
4.0%
-3.1pp
70 to 74
2021 count
241
% of total
2.9%
Change from 2016
-3.9pp
241
2.9%
-3.9pp
75 to 79
2021 count
186
% of total
2.3%
Change from 2016
-1.4pp
186
2.3%
-1.4pp
80 to 84
2021 count
100
% of total
1.2%
Change from 2016
+0.3pp
100
1.2%
+0.3pp
85 and over
2021 count
109
% of total
1.3%
Change from 2016
+1.3pp
109
1.3%
+1.3pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+316
-3.0pp
5 to 9
+314
-2.4pp
10 to 14
+342
-3.3pp
15 to 19
+341
-3.6pp
20 to 24
+586
+2.6pp
25 to 29
+907
+8.1pp
30 to 34
+868
+4.6pp
35 to 39
+733
+3.8pp
40 to 44
+589
-2.3pp
45 to 49
+577
+1.4pp
50 to 54
+589
-2.0pp
55 to 59
+432
-0.7pp
60 to 64
+351
-1.1pp
65 to 69
+301
-3.1pp
70 to 74
+219
-3.9pp
75 to 79
+174
-1.4pp
80 to 84
+97
+0.3pp
85 and over
+109
+1.3pp
Data table
Five year age groups for Petersham. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Inner West (A).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Inner West (A)% | Count | % | Inner West (A)% | Count | pp | |
| 0 to 4 | 339 | 4.1% | 5.0% | 23 | 7.1% | 5.9% | +316 | -3.0pp |
| 5 to 9 | 335 | 4.1% | 4.8% | 21 | 6.5% | 5.3% | +314 | -2.4pp |
| 10 to 14 | 367 | 4.5% | 4.8% | 25 | 7.8% | 4.1% | +342 | -3.3pp |
| 15 to 19 | 367 | 4.5% | 4.1% | 26 | 8.1% | 3.7% | +341 | -3.6pp |
| 20 to 24 | 601 | 7.3% | 6.2% | 15 | 4.7% | 7.0% | +586 | +2.6pp |
| 25 to 29 | 917 | 11.2% | 9.4% | 10 | 3.1% | 10.1% | +907 | +8.1pp |
| 30 to 34 | 888 | 10.8% | 9.9% | 20 | 6.2% | 10.2% | +868 | +4.6pp |
| 35 to 39 | 750 | 9.1% | 9.0% | 17 | 5.3% | 9.0% | +733 | +3.8pp |
| 40 to 44 | 621 | 7.6% | 7.7% | 32 | 9.9% | 8.4% | +589 | -2.3pp |
| 45 to 49 | 596 | 7.3% | 7.5% | 19 | 5.9% | 7.4% | +577 | +1.4pp |
| 50 to 54 | 620 | 7.6% | 6.8% | 31 | 9.6% | 6.5% | +589 | -2.0pp |
| 55 to 59 | 452 | 5.5% | 5.9% | 20 | 6.2% | 5.5% | +432 | -0.7pp |
| 60 to 64 | 369 | 4.5% | 4.9% | 18 | 5.6% | 4.7% | +351 | -1.1pp |
| 65 to 69 | 324 | 4.0% | 4.2% | 23 | 7.1% | 3.9% | +301 | -3.1pp |
| 70 to 74 | 241 | 2.9% | 3.6% | 22 | 6.8% | 2.8% | +219 | -3.9pp |
| 75 to 79 | 186 | 2.3% | 2.5% | 12 | 3.7% | 2.1% | +174 | -1.4pp |
| 80 to 84 | 100 | 1.2% | 1.8% | 3 | 0.9% | 1.7% | +97 | +0.3pp |
| 85 and over | 109 | 1.3% | 2.0% | 0 | 0.0% | 1.7% | +109 | +1.3pp |
| Total | 8,200 | 100.0% | 100.0% | 322 | 100.0% | 100.0% | +7,878 | 0.0pp |