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 North St Marys, accounting for 7.8% (321 people). This share was higher than Penrith (C) (7.4%). Since 2016, the biggest change was in 20 to 24 year olds, which decreased by 285 people and 15.2 percentage points.
Section overview
Age structure - Five year age groups
North St Marys - Total persons (Usual residence)
This table summarises five year age groups for North St Marys in 2021 for persons, with comparison against Penrith (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for North St Marys, with comparison markers for Penrith (C).
0 to 4
2021 count
269
% of total
6.5%
Change from 2016
+2.9pp
269
6.5%
+2.9pp
5 to 9
2021 count
319
% of total
7.7%
Change from 2016
+5.7pp
319
7.7%
+5.7pp
10 to 14
2021 count
290
% of total
7.0%
Change from 2016
+5.5pp
290
7.0%
+5.5pp
15 to 19
2021 count
270
% of total
6.5%
Change from 2016
-6.4pp
270
6.5%
-6.4pp
20 to 24
2021 count
301
% of total
7.3%
Change from 2016
-15.2pp
301
7.3%
-15.2pp
25 to 29
2021 count
321
% of total
7.8%
Change from 2016
-5.5pp
321
7.8%
-5.5pp
30 to 34
2021 count
293
% of total
7.1%
Change from 2016
-0.7pp
293
7.1%
-0.7pp
35 to 39
2021 count
278
% of total
6.7%
Change from 2016
+2.6pp
278
6.7%
+2.6pp
40 to 44
2021 count
198
% of total
4.8%
Change from 2016
+1.2pp
198
4.8%
+1.2pp
45 to 49
2021 count
253
% of total
6.1%
Change from 2016
+2.0pp
253
6.1%
+2.0pp
50 to 54
2021 count
243
% of total
5.9%
Change from 2016
+1.3pp
243
5.9%
+1.3pp
55 to 59
2021 count
251
% of total
6.1%
Change from 2016
+1.2pp
251
6.1%
+1.2pp
60 to 64
2021 count
186
% of total
4.5%
Change from 2016
+0.4pp
186
4.5%
+0.4pp
65 to 69
2021 count
156
% of total
3.8%
Change from 2016
+0.7pp
156
3.8%
+0.7pp
70 to 74
2021 count
160
% of total
3.9%
Change from 2016
+1.1pp
160
3.9%
+1.1pp
75 to 79
2021 count
122
% of total
3.0%
Change from 2016
+1.6pp
122
3.0%
+1.6pp
80 to 84
2021 count
89
% of total
2.2%
Change from 2016
+0.8pp
89
2.2%
+0.8pp
85 and over
2021 count
139
% of total
3.4%
Change from 2016
+1.6pp
139
3.4%
+1.6pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+176
+2.9pp
5 to 9
+267
+5.7pp
10 to 14
+250
+5.5pp
15 to 19
-67
-6.4pp
20 to 24
-285
-15.2pp
25 to 29
-27
-5.5pp
30 to 34
+89
-0.7pp
35 to 39
+172
+2.6pp
40 to 44
+103
+1.2pp
45 to 49
+145
+2.0pp
50 to 54
+122
+1.3pp
55 to 59
+124
+1.2pp
60 to 64
+79
+0.4pp
65 to 69
+76
+0.7pp
70 to 74
+86
+1.1pp
75 to 79
+85
+1.6pp
80 to 84
+53
+0.8pp
85 and over
+91
+1.6pp
Data table
Five year age groups for North St Marys. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Penrith (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Penrith (C)% | Count | % | Penrith (C)% | Count | pp | |
| 0 to 4 | 269 | 6.5% | 7.2% | 93 | 3.6% | 7.4% | +176 | +2.9pp |
| 5 to 9 | 319 | 7.7% | 7.2% | 52 | 2.0% | 7.2% | +267 | +5.7pp |
| 10 to 14 | 290 | 7.0% | 6.8% | 40 | 1.5% | 6.5% | +250 | +5.5pp |
| 15 to 19 | 270 | 6.5% | 6.2% | 337 | 12.9% | 6.6% | -67 | -6.4pp |
| 20 to 24 | 301 | 7.3% | 6.8% | 586 | 22.5% | 7.2% | -285 | -15.2pp |
| 25 to 29 | 321 | 7.8% | 7.4% | 348 | 13.3% | 7.7% | -27 | -5.5pp |
| 30 to 34 | 293 | 7.1% | 7.7% | 204 | 7.8% | 7.8% | +89 | -0.7pp |
| 35 to 39 | 278 | 6.7% | 7.8% | 106 | 4.1% | 7.1% | +172 | +2.6pp |
| 40 to 44 | 198 | 4.8% | 6.8% | 95 | 3.6% | 6.9% | +103 | +1.2pp |
| 45 to 49 | 253 | 6.1% | 6.4% | 108 | 4.1% | 6.4% | +145 | +2.0pp |
| 50 to 54 | 243 | 5.9% | 5.9% | 121 | 4.6% | 6.2% | +122 | +1.3pp |
| 55 to 59 | 251 | 6.1% | 5.5% | 127 | 4.9% | 6.1% | +124 | +1.2pp |
| 60 to 64 | 186 | 4.5% | 5.2% | 107 | 4.1% | 5.2% | +79 | +0.4pp |
| 65 to 69 | 156 | 3.8% | 4.3% | 80 | 3.1% | 4.5% | +76 | +0.7pp |
| 70 to 74 | 160 | 3.9% | 3.7% | 74 | 2.8% | 2.9% | +86 | +1.1pp |
| 75 to 79 | 122 | 3.0% | 2.3% | 37 | 1.4% | 1.9% | +85 | +1.6pp |
| 80 to 84 | 89 | 2.2% | 1.4% | 36 | 1.4% | 1.2% | +53 | +0.8pp |
| 85 and over | 139 | 3.4% | 1.2% | 48 | 1.8% | 1.2% | +91 | +1.6pp |
| Total | 4,123 | 100.0% | 100.0% | 2,608 | 100.0% | 100.0% | +1,515 | 0.0pp |