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, 50 to 54 year olds was the largest age group among residents in Birchgrove, accounting for 8.5% (275 people). This share was higher than Inner West (A) (6.8%). Since 2016, the biggest change was in 75 to 79 year olds, which increased by 72 people and 2.3 percentage points.
Section overview
Age structure - Five year age groups
Birchgrove - Total persons (Usual residence)
This table summarises five year age groups for Birchgrove 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 Birchgrove, with comparison markers for Inner West (A).
0 to 4
2021 count
160
% of total
5.0%
Change from 2016
-1.9pp
160
5.0%
-1.9pp
5 to 9
2021 count
186
% of total
5.8%
Change from 2016
-1.2pp
186
5.8%
-1.2pp
10 to 14
2021 count
205
% of total
6.4%
Change from 2016
+1.2pp
205
6.4%
+1.2pp
15 to 19
2021 count
161
% of total
5.0%
Change from 2016
+1.2pp
161
5.0%
+1.2pp
20 to 24
2021 count
100
% of total
3.1%
Change from 2016
-0.9pp
100
3.1%
-0.9pp
25 to 29
2021 count
117
% of total
3.6%
Change from 2016
-0.6pp
117
3.6%
-0.6pp
30 to 34
2021 count
182
% of total
5.6%
Change from 2016
-0.4pp
182
5.6%
-0.4pp
35 to 39
2021 count
189
% of total
5.9%
Change from 2016
-1.7pp
189
5.9%
-1.7pp
40 to 44
2021 count
243
% of total
7.5%
Change from 2016
-0.9pp
243
7.5%
-0.9pp
45 to 49
2021 count
245
% of total
7.6%
Change from 2016
-1.2pp
245
7.6%
-1.2pp
50 to 54
2021 count
275
% of total
8.5%
Change from 2016
+0.3pp
275
8.5%
+0.3pp
55 to 59
2021 count
242
% of total
7.5%
Change from 2016
+0.3pp
242
7.5%
+0.3pp
60 to 64
2021 count
231
% of total
7.2%
Change from 2016
0.0pp
231
7.2%
0.0pp
65 to 69
2021 count
230
% of total
7.1%
Change from 2016
+0.5pp
230
7.1%
+0.5pp
70 to 74
2021 count
201
% of total
6.2%
Change from 2016
+1.1pp
201
6.2%
+1.1pp
75 to 79
2021 count
135
% of total
4.2%
Change from 2016
+2.3pp
135
4.2%
+2.3pp
80 to 84
2021 count
66
% of total
2.0%
Change from 2016
+0.9pp
66
2.0%
+0.9pp
85 and over
2021 count
36
% of total
1.1%
Change from 2016
+0.4pp
36
1.1%
+0.4pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-68
-1.9pp
5 to 9
-45
-1.2pp
10 to 14
+32
+1.2pp
15 to 19
+35
+1.2pp
20 to 24
-31
-0.9pp
25 to 29
-23
-0.6pp
30 to 34
-15
-0.4pp
35 to 39
-61
-1.7pp
40 to 44
-34
-0.9pp
45 to 49
-45
-1.2pp
50 to 54
+5
+0.3pp
55 to 59
+3
+0.3pp
60 to 64
-8
0.0pp
65 to 69
+11
+0.5pp
70 to 74
+33
+1.1pp
75 to 79
+72
+2.3pp
80 to 84
+31
+0.9pp
85 and over
+12
+0.4pp
Data table
Five year age groups for Birchgrove. 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 | 160 | 5.0% | 5.0% | 228 | 6.9% | 5.9% | -68 | -1.9pp |
| 5 to 9 | 186 | 5.8% | 4.8% | 231 | 7.0% | 5.3% | -45 | -1.2pp |
| 10 to 14 | 205 | 6.4% | 4.8% | 173 | 5.2% | 4.1% | +32 | +1.2pp |
| 15 to 19 | 161 | 5.0% | 4.1% | 126 | 3.8% | 3.7% | +35 | +1.2pp |
| 20 to 24 | 100 | 3.1% | 6.2% | 131 | 4.0% | 7.0% | -31 | -0.9pp |
| 25 to 29 | 117 | 3.6% | 9.4% | 140 | 4.2% | 10.1% | -23 | -0.6pp |
| 30 to 34 | 182 | 5.6% | 9.9% | 197 | 6.0% | 10.2% | -15 | -0.4pp |
| 35 to 39 | 189 | 5.9% | 9.0% | 250 | 7.6% | 9.0% | -61 | -1.7pp |
| 40 to 44 | 243 | 7.5% | 7.7% | 277 | 8.4% | 8.4% | -34 | -0.9pp |
| 45 to 49 | 245 | 7.6% | 7.5% | 290 | 8.8% | 7.4% | -45 | -1.2pp |
| 50 to 54 | 275 | 8.5% | 6.8% | 270 | 8.2% | 6.5% | +5 | +0.3pp |
| 55 to 59 | 242 | 7.5% | 5.9% | 239 | 7.2% | 5.5% | +3 | +0.3pp |
| 60 to 64 | 231 | 7.2% | 4.9% | 239 | 7.2% | 4.7% | -8 | 0.0pp |
| 65 to 69 | 230 | 7.1% | 4.2% | 219 | 6.6% | 3.9% | +11 | +0.5pp |
| 70 to 74 | 201 | 6.2% | 3.6% | 168 | 5.1% | 2.8% | +33 | +1.1pp |
| 75 to 79 | 135 | 4.2% | 2.5% | 63 | 1.9% | 2.1% | +72 | +2.3pp |
| 80 to 84 | 66 | 2.0% | 1.8% | 35 | 1.1% | 1.7% | +31 | +0.9pp |
| 85 and over | 36 | 1.1% | 2.0% | 24 | 0.7% | 1.7% | +12 | +0.4pp |
| Total | 3,228 | 100.0% | 100.0% | 3,303 | 100.0% | 100.0% | -75 | 0.0pp |