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, 5 to 9 year olds was the largest age group among residents in Aldinga Beach, accounting for 7.5% (805 people). This share was higher than Onkaparinga (C) (6.2%). Since 2016, the biggest change was in 0 to 4 year olds, which decreased by 299 people and 2.9 percentage points.
Section overview
Age structure - Five year age groups
Aldinga Beach - Total persons (Usual residence)
This table summarises five year age groups for Aldinga Beach 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 Aldinga Beach, with comparison markers for Onkaparinga (C).
0 to 4
2021 count
609
% of total
5.7%
Change from 2016
-2.9pp
609
5.7%
-2.9pp
5 to 9
2021 count
805
% of total
7.5%
Change from 2016
-1.0pp
805
7.5%
-1.0pp
10 to 14
2021 count
804
% of total
7.5%
Change from 2016
+0.4pp
804
7.5%
+0.4pp
15 to 19
2021 count
685
% of total
6.4%
Change from 2016
+0.1pp
685
6.4%
+0.1pp
20 to 24
2021 count
568
% of total
5.3%
Change from 2016
-0.2pp
568
5.3%
-0.2pp
25 to 29
2021 count
555
% of total
5.2%
Change from 2016
-1.1pp
555
5.2%
-1.1pp
30 to 34
2021 count
638
% of total
6.0%
Change from 2016
-1.3pp
638
6.0%
-1.3pp
35 to 39
2021 count
772
% of total
7.2%
Change from 2016
+0.4pp
772
7.2%
+0.4pp
40 to 44
2021 count
676
% of total
6.3%
Change from 2016
-0.4pp
676
6.3%
-0.4pp
45 to 49
2021 count
669
% of total
6.3%
Change from 2016
-0.1pp
669
6.3%
-0.1pp
50 to 54
2021 count
662
% of total
6.2%
Change from 2016
-0.1pp
662
6.2%
-0.1pp
55 to 59
2021 count
674
% of total
6.3%
Change from 2016
+1.2pp
674
6.3%
+1.2pp
60 to 64
2021 count
596
% of total
5.6%
Change from 2016
+0.4pp
596
5.6%
+0.4pp
65 to 69
2021 count
570
% of total
5.3%
Change from 2016
+0.4pp
570
5.3%
+0.4pp
70 to 74
2021 count
548
% of total
5.1%
Change from 2016
+1.7pp
548
5.1%
+1.7pp
75 to 79
2021 count
382
% of total
3.6%
Change from 2016
+1.1pp
382
3.6%
+1.1pp
80 to 84
2021 count
244
% of total
2.3%
Change from 2016
+0.7pp
244
2.3%
+0.7pp
85 and over
2021 count
219
% of total
2.1%
Change from 2016
+0.4pp
219
2.1%
+0.4pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
-299
-2.9pp
5 to 9
-95
-1.0pp
10 to 14
+59
+0.4pp
15 to 19
+25
+0.1pp
20 to 24
-8
-0.2pp
25 to 29
-107
-1.1pp
30 to 34
-129
-1.3pp
35 to 39
+56
+0.4pp
40 to 44
-29
-0.4pp
45 to 49
-5
-0.1pp
50 to 54
-5
-0.1pp
55 to 59
+134
+1.2pp
60 to 64
+45
+0.4pp
65 to 69
+56
+0.4pp
70 to 74
+187
+1.7pp
75 to 79
+114
+1.1pp
80 to 84
+79
+0.7pp
85 and over
+39
+0.4pp
Data table
Five year age groups for Aldinga Beach. 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 | 609 | 5.7% | 5.4% | 908 | 8.6% | 6.2% | -299 | -2.9pp |
| 5 to 9 | 805 | 7.5% | 6.2% | 900 | 8.5% | 6.4% | -95 | -1.0pp |
| 10 to 14 | 804 | 7.5% | 6.2% | 745 | 7.1% | 6.1% | +59 | +0.4pp |
| 15 to 19 | 685 | 6.4% | 5.8% | 660 | 6.3% | 6.2% | +25 | +0.1pp |
| 20 to 24 | 568 | 5.3% | 5.6% | 576 | 5.5% | 6.0% | -8 | -0.2pp |
| 25 to 29 | 555 | 5.2% | 6.0% | 662 | 6.3% | 5.9% | -107 | -1.1pp |
| 30 to 34 | 638 | 6.0% | 6.3% | 767 | 7.3% | 6.5% | -129 | -1.3pp |
| 35 to 39 | 772 | 7.2% | 6.7% | 716 | 6.8% | 6.3% | +56 | +0.4pp |
| 40 to 44 | 676 | 6.3% | 6.1% | 705 | 6.7% | 6.6% | -29 | -0.4pp |
| 45 to 49 | 669 | 6.3% | 6.4% | 674 | 6.4% | 6.9% | -5 | -0.1pp |
| 50 to 54 | 662 | 6.2% | 6.6% | 667 | 6.3% | 6.7% | -5 | -0.1pp |
| 55 to 59 | 674 | 6.3% | 6.5% | 540 | 5.1% | 6.6% | +134 | +1.2pp |
| 60 to 64 | 596 | 5.6% | 6.3% | 551 | 5.2% | 6.3% | +45 | +0.4pp |
| 65 to 69 | 570 | 5.3% | 5.9% | 514 | 4.9% | 6.1% | +56 | +0.4pp |
| 70 to 74 | 548 | 5.1% | 5.7% | 361 | 3.4% | 4.3% | +187 | +1.7pp |
| 75 to 79 | 382 | 3.6% | 3.8% | 268 | 2.5% | 2.8% | +114 | +1.1pp |
| 80 to 84 | 244 | 2.3% | 2.3% | 165 | 1.6% | 2.0% | +79 | +0.7pp |
| 85 and over | 219 | 2.1% | 2.2% | 180 | 1.7% | 2.1% | +39 | +0.4pp |
| Total | 10,667 | 100.0% | 100.0% | 10,557 | 100.0% | 100.0% | +110 | 0.0pp |