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 70 to 74 year olds, which increased by 236 people and 2.2 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
+0.2pp
519
5.1%
+0.2pp
5 to 9
2021 count
602
% of total
5.9%
Change from 2016
-0.3pp
602
5.9%
-0.3pp
10 to 14
2021 count
652
% of total
6.4%
Change from 2016
+0.2pp
652
6.4%
+0.2pp
15 to 19
2021 count
645
% of total
6.3%
Change from 2016
-0.8pp
645
6.3%
-0.8pp
20 to 24
2021 count
594
% of total
5.8%
Change from 2016
0.0pp
594
5.8%
0.0pp
25 to 29
2021 count
443
% of total
4.3%
Change from 2016
0.0pp
443
4.3%
0.0pp
30 to 34
2021 count
541
% of total
5.3%
Change from 2016
+0.2pp
541
5.3%
+0.2pp
35 to 39
2021 count
642
% of total
6.3%
Change from 2016
-0.1pp
642
6.3%
-0.1pp
40 to 44
2021 count
677
% of total
6.6%
Change from 2016
-0.4pp
677
6.6%
-0.4pp
45 to 49
2021 count
707
% of total
6.9%
Change from 2016
-0.8pp
707
6.9%
-0.8pp
50 to 54
2021 count
741
% of total
7.3%
Change from 2016
-0.3pp
741
7.3%
-0.3pp
55 to 59
2021 count
706
% of total
6.9%
Change from 2016
-0.8pp
706
6.9%
-0.8pp
60 to 64
2021 count
701
% of total
6.9%
Change from 2016
+0.3pp
701
6.9%
+0.3pp
65 to 69
2021 count
610
% of total
6.0%
Change from 2016
-1.4pp
610
6.0%
-1.4pp
70 to 74
2021 count
677
% of total
6.6%
Change from 2016
+2.2pp
677
6.6%
+2.2pp
75 to 79
2021 count
406
% of total
4.0%
Change from 2016
+1.8pp
406
4.0%
+1.8pp
80 to 84
2021 count
181
% of total
1.8%
Change from 2016
+0.5pp
181
1.8%
+0.5pp
85 and over
2021 count
162
% of total
1.6%
Change from 2016
0.0pp
162
1.6%
0.0pp
Chart view
Age structure - Five year age groups change
Absolute change in category counts between 2016 and 2021.
0 to 4
+30
+0.2pp
5 to 9
-16
-0.3pp
10 to 14
+34
+0.2pp
15 to 19
-62
-0.8pp
20 to 24
+14
0.0pp
25 to 29
+11
0.0pp
30 to 34
+36
+0.2pp
35 to 39
+7
-0.1pp
40 to 44
-21
-0.4pp
45 to 49
-60
-0.8pp
50 to 54
-12
-0.3pp
55 to 59
-63
-0.8pp
60 to 64
+43
+0.3pp
65 to 69
-123
-1.4pp
70 to 74
+236
+2.2pp
75 to 79
+183
+1.8pp
80 to 84
+47
+0.5pp
85 and over
+5
0.0pp
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% | 489 | 4.9% | 6.2% | +30 | +0.2pp |
| 5 to 9 | 602 | 5.9% | 6.2% | 618 | 6.2% | 6.4% | -16 | -0.3pp |
| 10 to 14 | 652 | 6.4% | 6.2% | 618 | 6.2% | 6.1% | +34 | +0.2pp |
| 15 to 19 | 645 | 6.3% | 5.8% | 707 | 7.1% | 6.2% | -62 | -0.8pp |
| 20 to 24 | 594 | 5.8% | 5.6% | 580 | 5.8% | 6.0% | +14 | 0.0pp |
| 25 to 29 | 443 | 4.3% | 6.0% | 432 | 4.3% | 5.9% | +11 | 0.0pp |
| 30 to 34 | 541 | 5.3% | 6.3% | 505 | 5.1% | 6.5% | +36 | +0.2pp |
| 35 to 39 | 642 | 6.3% | 6.7% | 635 | 6.4% | 6.3% | +7 | -0.1pp |
| 40 to 44 | 677 | 6.6% | 6.1% | 698 | 7.0% | 6.6% | -21 | -0.4pp |
| 45 to 49 | 707 | 6.9% | 6.4% | 767 | 7.7% | 6.9% | -60 | -0.8pp |
| 50 to 54 | 741 | 7.3% | 6.6% | 753 | 7.6% | 6.7% | -12 | -0.3pp |
| 55 to 59 | 706 | 6.9% | 6.5% | 769 | 7.7% | 6.6% | -63 | -0.8pp |
| 60 to 64 | 701 | 6.9% | 6.3% | 658 | 6.6% | 6.3% | +43 | +0.3pp |
| 65 to 69 | 610 | 6.0% | 5.9% | 733 | 7.4% | 6.1% | -123 | -1.4pp |
| 70 to 74 | 677 | 6.6% | 5.7% | 441 | 4.4% | 4.3% | +236 | +2.2pp |
| 75 to 79 | 406 | 4.0% | 3.8% | 223 | 2.2% | 2.8% | +183 | +1.8pp |
| 80 to 84 | 181 | 1.8% | 2.3% | 134 | 1.3% | 2.0% | +47 | +0.5pp |
| 85 and over | 162 | 1.6% | 2.2% | 157 | 1.6% | 2.1% | +5 | 0.0pp |
| Total | 10,184 | 100.0% | 100.0% | 9,950 | 100.0% | 100.0% | +234 | 0.0pp |