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 Seaview Downs, accounting for 7.2% (197 people). This share was higher than Marion (C) (5.9%). Since 2016, the biggest change was in 45 to 49 year olds, which increased by 180 people, while its share fell by 4.6 percentage points.
Section overview
Age structure - Five year age groups
Seaview Downs - Total persons (Usual residence)
This table summarises five year age groups for Seaview Downs in 2021 for persons, with comparison against Marion (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Seaview Downs, with comparison markers for Marion (C).
0 to 4
2021 count
150
% of total
5.5%
Change from 2016
+5.5pp
150
5.5%
+5.5pp
5 to 9
2021 count
180
% of total
6.6%
Change from 2016
+0.8pp
180
6.6%
+0.8pp
10 to 14
2021 count
179
% of total
6.6%
Change from 2016
-0.9pp
179
6.6%
-0.9pp
15 to 19
2021 count
167
% of total
6.1%
Change from 2016
+3.6pp
167
6.1%
+3.6pp
20 to 24
2021 count
140
% of total
5.2%
Change from 2016
+5.2pp
140
5.2%
+5.2pp
25 to 29
2021 count
107
% of total
3.9%
Change from 2016
+3.9pp
107
3.9%
+3.9pp
30 to 34
2021 count
157
% of total
5.8%
Change from 2016
+5.8pp
157
5.8%
+5.8pp
35 to 39
2021 count
180
% of total
6.6%
Change from 2016
+0.8pp
180
6.6%
+0.8pp
40 to 44
2021 count
174
% of total
6.4%
Change from 2016
+0.6pp
174
6.4%
+0.6pp
45 to 49
2021 count
194
% of total
7.1%
Change from 2016
-4.6pp
194
7.1%
-4.6pp
50 to 54
2021 count
197
% of total
7.2%
Change from 2016
-8.6pp
197
7.2%
-8.6pp
55 to 59
2021 count
156
% of total
5.7%
Change from 2016
+3.2pp
156
5.7%
+3.2pp
60 to 64
2021 count
159
% of total
5.8%
Change from 2016
0.0pp
159
5.8%
0.0pp
65 to 69
2021 count
141
% of total
5.2%
Change from 2016
+2.7pp
141
5.2%
+2.7pp
70 to 74
2021 count
157
% of total
5.8%
Change from 2016
+1.6pp
157
5.8%
+1.6pp
75 to 79
2021 count
142
% of total
5.2%
Change from 2016
+2.7pp
142
5.2%
+2.7pp
80 to 84
2021 count
81
% of total
3.0%
Change from 2016
+3.0pp
81
3.0%
+3.0pp
85 and over
2021 count
63
% of total
2.3%
Change from 2016
+2.3pp
63
2.3%
+2.3pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+150
+5.5pp
5 to 9
+173
+0.8pp
10 to 14
+170
-0.9pp
15 to 19
+164
+3.6pp
20 to 24
+140
+5.2pp
25 to 29
+107
+3.9pp
30 to 34
+157
+5.8pp
35 to 39
+173
+0.8pp
40 to 44
+167
+0.6pp
45 to 49
+180
-4.6pp
50 to 54
+178
-8.6pp
55 to 59
+153
+3.2pp
60 to 64
+152
0.0pp
65 to 69
+138
+2.7pp
70 to 74
+152
+1.6pp
75 to 79
+139
+2.7pp
80 to 84
+81
+3.0pp
85 and over
+63
+2.3pp
Data table
Five year age groups for Seaview Downs. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Marion (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Marion (C)% | Count | % | Marion (C)% | Count | pp | |
| 0 to 4 | 150 | 5.5% | 5.4% | 0 | 0.0% | 5.9% | +150 | +5.5pp |
| 5 to 9 | 180 | 6.6% | 5.6% | 7 | 5.8% | 5.4% | +173 | +0.8pp |
| 10 to 14 | 179 | 6.6% | 5.2% | 9 | 7.5% | 4.9% | +170 | -0.9pp |
| 15 to 19 | 167 | 6.1% | 5.1% | 3 | 2.5% | 5.7% | +164 | +3.6pp |
| 20 to 24 | 140 | 5.2% | 6.7% | 0 | 0.0% | 7.2% | +140 | +5.2pp |
| 25 to 29 | 107 | 3.9% | 7.4% | 0 | 0.0% | 7.3% | +107 | +3.9pp |
| 30 to 34 | 157 | 5.8% | 7.7% | 0 | 0.0% | 7.5% | +157 | +5.8pp |
| 35 to 39 | 180 | 6.6% | 7.5% | 7 | 5.8% | 6.8% | +173 | +0.8pp |
| 40 to 44 | 174 | 6.4% | 6.6% | 7 | 5.8% | 6.4% | +167 | +0.6pp |
| 45 to 49 | 194 | 7.1% | 6.1% | 14 | 11.7% | 6.3% | +180 | -4.6pp |
| 50 to 54 | 197 | 7.2% | 5.9% | 19 | 15.8% | 6.4% | +178 | -8.6pp |
| 55 to 59 | 156 | 5.7% | 5.9% | 3 | 2.5% | 6.6% | +153 | +3.2pp |
| 60 to 64 | 159 | 5.8% | 6.1% | 7 | 5.8% | 6.2% | +152 | 0.0pp |
| 65 to 69 | 141 | 5.2% | 5.7% | 3 | 2.5% | 5.2% | +138 | +2.7pp |
| 70 to 74 | 157 | 5.8% | 4.8% | 5 | 4.2% | 3.7% | +152 | +1.6pp |
| 75 to 79 | 142 | 5.2% | 3.3% | 3 | 2.5% | 2.9% | +139 | +2.7pp |
| 80 to 84 | 81 | 3.0% | 2.3% | 0 | 0.0% | 2.4% | +81 | +3.0pp |
| 85 and over | 63 | 2.3% | 2.9% | 0 | 0.0% | 3.1% | +63 | +2.3pp |
| Total | 2,718 | 100.0% | 100.0% | 120 | 100.0% | 100.0% | +2,598 | 0.0pp |