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, 10 to 14 year olds was the largest age group among residents in Seaford Rise, accounting for 8.1% (497 people). This share was higher than Onkaparinga (C) (6.2%). Since 2016, the biggest change was in 10 to 14 year olds, which increased by 450 people and 3.5 percentage points.
Section overview
Age structure - Five year age groups
Seaford Rise - Total persons (Usual residence)
This table summarises five year age groups for Seaford Rise in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
Age structure - Five year age groups snapshot
2021 distribution by category for Seaford Rise, with comparison markers for Onkaparinga (C).
0 to 4
2021 count
354
% of total
5.8%
Change from 2016
+0.3pp
354
5.8%
+0.3pp
5 to 9
2021 count
444
% of total
7.3%
Change from 2016
+0.6pp
444
7.3%
+0.6pp
10 to 14
2021 count
497
% of total
8.1%
Change from 2016
+3.5pp
497
8.1%
+3.5pp
15 to 19
2021 count
398
% of total
6.5%
Change from 2016
+1.8pp
398
6.5%
+1.8pp
20 to 24
2021 count
330
% of total
5.4%
Change from 2016
+0.5pp
330
5.4%
+0.5pp
25 to 29
2021 count
306
% of total
5.0%
Change from 2016
-0.2pp
306
5.0%
-0.2pp
30 to 34
2021 count
333
% of total
5.5%
Change from 2016
+1.0pp
333
5.5%
+1.0pp
35 to 39
2021 count
430
% of total
7.0%
Change from 2016
-0.2pp
430
7.0%
-0.2pp
40 to 44
2021 count
432
% of total
7.1%
Change from 2016
-1.8pp
432
7.1%
-1.8pp
45 to 49
2021 count
403
% of total
6.6%
Change from 2016
-0.8pp
403
6.6%
-0.8pp
50 to 54
2021 count
441
% of total
7.2%
Change from 2016
-0.6pp
441
7.2%
-0.6pp
55 to 59
2021 count
419
% of total
6.9%
Change from 2016
+0.1pp
419
6.9%
+0.1pp
60 to 64
2021 count
317
% of total
5.2%
Change from 2016
-0.4pp
317
5.2%
-0.4pp
65 to 69
2021 count
307
% of total
5.0%
Change from 2016
-0.6pp
307
5.0%
-0.6pp
70 to 74
2021 count
268
% of total
4.4%
Change from 2016
+0.5pp
268
4.4%
+0.5pp
75 to 79
2021 count
214
% of total
3.5%
Change from 2016
+0.1pp
214
3.5%
+0.1pp
80 to 84
2021 count
118
% of total
1.9%
Change from 2016
-0.9pp
118
1.9%
-0.9pp
85 and over
2021 count
97
% of total
1.6%
Change from 2016
-1.3pp
97
1.6%
-1.3pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+298
+0.3pp
5 to 9
+376
+0.6pp
10 to 14
+450
+3.5pp
15 to 19
+350
+1.8pp
20 to 24
+280
+0.5pp
25 to 29
+253
-0.2pp
30 to 34
+287
+1.0pp
35 to 39
+357
-0.2pp
40 to 44
+341
-1.8pp
45 to 49
+328
-0.8pp
50 to 54
+362
-0.6pp
55 to 59
+350
+0.1pp
60 to 64
+260
-0.4pp
65 to 69
+250
-0.6pp
70 to 74
+228
+0.5pp
75 to 79
+179
+0.1pp
80 to 84
+89
-0.9pp
85 and over
+67
-1.3pp
Data table
Five year age groups for Seaford Rise. Age structure - Five year age groups. 2021 and 2016 counts, percentages, and change compared with Onkaparinga (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Onkaparinga (C)% | Count | % | Onkaparinga (C)% | Count | pp | |
| 0 to 4 | 354 | 5.8% | 5.4% | 56 | 5.5% | 6.2% | +298 | +0.3pp |
| 5 to 9 | 444 | 7.3% | 6.2% | 68 | 6.7% | 6.4% | +376 | +0.6pp |
| 10 to 14 | 497 | 8.1% | 6.2% | 47 | 4.6% | 6.1% | +450 | +3.5pp |
| 15 to 19 | 398 | 6.5% | 5.8% | 48 | 4.7% | 6.2% | +350 | +1.8pp |
| 20 to 24 | 330 | 5.4% | 5.6% | 50 | 4.9% | 6.0% | +280 | +0.5pp |
| 25 to 29 | 306 | 5.0% | 6.0% | 53 | 5.2% | 5.9% | +253 | -0.2pp |
| 30 to 34 | 333 | 5.5% | 6.3% | 46 | 4.5% | 6.5% | +287 | +1.0pp |
| 35 to 39 | 430 | 7.0% | 6.7% | 73 | 7.2% | 6.3% | +357 | -0.2pp |
| 40 to 44 | 432 | 7.1% | 6.1% | 91 | 8.9% | 6.6% | +341 | -1.8pp |
| 45 to 49 | 403 | 6.6% | 6.4% | 75 | 7.4% | 6.9% | +328 | -0.8pp |
| 50 to 54 | 441 | 7.2% | 6.6% | 79 | 7.8% | 6.7% | +362 | -0.6pp |
| 55 to 59 | 419 | 6.9% | 6.5% | 69 | 6.8% | 6.6% | +350 | +0.1pp |
| 60 to 64 | 317 | 5.2% | 6.3% | 57 | 5.6% | 6.3% | +260 | -0.4pp |
| 65 to 69 | 307 | 5.0% | 5.9% | 57 | 5.6% | 6.1% | +250 | -0.6pp |
| 70 to 74 | 268 | 4.4% | 5.7% | 40 | 3.9% | 4.3% | +228 | +0.5pp |
| 75 to 79 | 214 | 3.5% | 3.8% | 35 | 3.4% | 2.8% | +179 | +0.1pp |
| 80 to 84 | 118 | 1.9% | 2.3% | 29 | 2.8% | 2.0% | +89 | -0.9pp |
| 85 and over | 97 | 1.6% | 2.2% | 30 | 2.9% | 2.1% | +67 | -1.3pp |
| Total | 6,105 | 100.0% | 100.0% | 1,019 | 100.0% | 100.0% | +5,086 | 0.0pp |