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 Flagstaff Hill, accounting for 7.3% (741 people). This share was higher than Onkaparinga (C) (6.6%). Since 2016, the biggest change was in 50 to 54 year olds, which increased by 735 people and 1.5 percentage points.
Section overview
Age structure - Five year age groups
Flagstaff Hill - Total persons (Usual residence)
This table summarises five year age groups for Flagstaff Hill 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 Flagstaff Hill, with comparison markers for Onkaparinga (C).
0 to 4
2021 count
519
% of total
5.1%
Change from 2016
+5.1pp
519
5.1%
+5.1pp
5 to 9
2021 count
602
% of total
5.9%
Change from 2016
+3.0pp
602
5.9%
+3.0pp
10 to 14
2021 count
652
% of total
6.4%
Change from 2016
+2.6pp
652
6.4%
+2.6pp
15 to 19
2021 count
645
% of total
6.3%
Change from 2016
-0.4pp
645
6.3%
-0.4pp
20 to 24
2021 count
594
% of total
5.8%
Change from 2016
+5.8pp
594
5.8%
+5.8pp
25 to 29
2021 count
443
% of total
4.3%
Change from 2016
-1.5pp
443
4.3%
-1.5pp
30 to 34
2021 count
541
% of total
5.3%
Change from 2016
+2.4pp
541
5.3%
+2.4pp
35 to 39
2021 count
642
% of total
6.3%
Change from 2016
+6.3pp
642
6.3%
+6.3pp
40 to 44
2021 count
677
% of total
6.6%
Change from 2016
-0.1pp
677
6.6%
-0.1pp
45 to 49
2021 count
707
% of total
6.9%
Change from 2016
+6.9pp
707
6.9%
+6.9pp
50 to 54
2021 count
741
% of total
7.3%
Change from 2016
+1.5pp
741
7.3%
+1.5pp
55 to 59
2021 count
706
% of total
6.9%
Change from 2016
-3.7pp
706
6.9%
-3.7pp
60 to 64
2021 count
701
% of total
6.9%
Change from 2016
-8.5pp
701
6.9%
-8.5pp
65 to 69
2021 count
610
% of total
6.0%
Change from 2016
-2.7pp
610
6.0%
-2.7pp
70 to 74
2021 count
677
% of total
6.6%
Change from 2016
-4.9pp
677
6.6%
-4.9pp
75 to 79
2021 count
406
% of total
4.0%
Change from 2016
+4.0pp
406
4.0%
+4.0pp
80 to 84
2021 count
181
% of total
1.8%
Change from 2016
+1.8pp
181
1.8%
+1.8pp
85 and over
2021 count
162
% of total
1.6%
Change from 2016
+1.6pp
162
1.6%
+1.6pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+519
+5.1pp
5 to 9
+599
+3.0pp
10 to 14
+648
+2.6pp
15 to 19
+638
-0.4pp
20 to 24
+594
+5.8pp
25 to 29
+437
-1.5pp
30 to 34
+538
+2.4pp
35 to 39
+642
+6.3pp
40 to 44
+670
-0.1pp
45 to 49
+707
+6.9pp
50 to 54
+735
+1.5pp
55 to 59
+695
-3.7pp
60 to 64
+685
-8.5pp
65 to 69
+601
-2.7pp
70 to 74
+665
-4.9pp
75 to 79
+406
+4.0pp
80 to 84
+181
+1.8pp
85 and over
+162
+1.6pp
Data table
Five year age groups for Flagstaff Hill. 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 | 519 | 5.1% | 5.4% | 0 | 0.0% | 6.2% | +519 | +5.1pp |
| 5 to 9 | 602 | 5.9% | 6.2% | 3 | 2.9% | 6.4% | +599 | +3.0pp |
| 10 to 14 | 652 | 6.4% | 6.2% | 4 | 3.8% | 6.1% | +648 | +2.6pp |
| 15 to 19 | 645 | 6.3% | 5.8% | 7 | 6.7% | 6.2% | +638 | -0.4pp |
| 20 to 24 | 594 | 5.8% | 5.6% | 0 | 0.0% | 6.0% | +594 | +5.8pp |
| 25 to 29 | 443 | 4.3% | 6.0% | 6 | 5.8% | 5.9% | +437 | -1.5pp |
| 30 to 34 | 541 | 5.3% | 6.3% | 3 | 2.9% | 6.5% | +538 | +2.4pp |
| 35 to 39 | 642 | 6.3% | 6.7% | 0 | 0.0% | 6.3% | +642 | +6.3pp |
| 40 to 44 | 677 | 6.6% | 6.1% | 7 | 6.7% | 6.6% | +670 | -0.1pp |
| 45 to 49 | 707 | 6.9% | 6.4% | 0 | 0.0% | 6.9% | +707 | +6.9pp |
| 50 to 54 | 741 | 7.3% | 6.6% | 6 | 5.8% | 6.7% | +735 | +1.5pp |
| 55 to 59 | 706 | 6.9% | 6.5% | 11 | 10.6% | 6.6% | +695 | -3.7pp |
| 60 to 64 | 701 | 6.9% | 6.3% | 16 | 15.4% | 6.3% | +685 | -8.5pp |
| 65 to 69 | 610 | 6.0% | 5.9% | 9 | 8.7% | 6.1% | +601 | -2.7pp |
| 70 to 74 | 677 | 6.6% | 5.7% | 12 | 11.5% | 4.3% | +665 | -4.9pp |
| 75 to 79 | 406 | 4.0% | 3.8% | 0 | 0.0% | 2.8% | +406 | +4.0pp |
| 80 to 84 | 181 | 1.8% | 2.3% | 0 | 0.0% | 2.0% | +181 | +1.8pp |
| 85 and over | 162 | 1.6% | 2.2% | 0 | 0.0% | 2.1% | +162 | +1.6pp |
| Total | 10,184 | 100.0% | 100.0% | 104 | 100.0% | 100.0% | +10,080 | 0.0pp |