Population
Service age groups
About this topic
Service age groups divide the population into broad life-stage bands such as children, young adults, working-age adults, and older people. The groupings are designed to reflect typical demand for age-based services and facilities rather than exact five-year cohorts.
This view is useful for planning childcare, schools, recreation, aged services, and other community infrastructure. It works best alongside five year age groups, household type, and dwelling data, which add more detail about who is living in an area and how needs may change over time.
Interpretation notes
- This is a derived grouping rather than a direct Census question, so the age bands are planning-oriented summaries built from standard age data.
- Percentages relate to the total population; use five year age groups when exact cohort detail matters.
Related topics
Key insight
In 2021, Parents and homebuilders (35 to 49) was the most common category among residents in Flagstaff Hill, accounting for 19.9% (2,026 people). This share was higher than Onkaparinga (C) (19.2%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which increased by 2,019 people and 13.2 percentage points.
Section overview
Age structure - Service age groups
Flagstaff Hill - Total persons (Usual residence)
This table summarises service age groups for Flagstaff Hill in 2021 for persons, with comparison against Onkaparinga (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Flagstaff Hill, with comparison markers for Onkaparinga (C).
Babies and pre-schoolers (0 to 4)
2021 count
519
% of total
5.1%
Change from 2016
+5.1pp
519
5.1%
+5.1pp
Primary schoolers (5 to 11)
2021 count
848
% of total
8.3%
Change from 2016
+1.6pp
848
8.3%
+1.6pp
Secondary schoolers (12 to 17)
2021 count
792
% of total
7.8%
Change from 2016
+4.9pp
792
7.8%
+4.9pp
Tertiary education and independence (18 to 24)
2021 count
853
% of total
8.4%
Change from 2016
+4.6pp
853
8.4%
+4.6pp
Young workforce (25 to 34)
2021 count
984
% of total
9.7%
Change from 2016
+1.0pp
984
9.7%
+1.0pp
Parents and homebuilders (35 to 49)
2021 count
2,026
% of total
19.9%
Change from 2016
+13.2pp
2,026
19.9%
+13.2pp
Older workers and pre-retirees (50 to 59)
2021 count
1,447
% of total
14.2%
Change from 2016
-2.1pp
1,447
14.2%
-2.1pp
Empty nesters and retirees (60 to 69)
2021 count
1,311
% of total
12.9%
Change from 2016
-11.1pp
1,311
12.9%
-11.1pp
Seniors (70 to 84)
2021 count
1,264
% of total
12.4%
Change from 2016
+0.9pp
1,264
12.4%
+0.9pp
Elderly aged (85 and over)
2021 count
162
% of total
1.6%
Change from 2016
+1.6pp
162
1.6%
+1.6pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+519
+5.1pp
Primary schoolers (5 to 11)
+841
+1.6pp
Secondary schoolers (12 to 17)
+789
+4.9pp
Tertiary education and independence (18 to 24)
+849
+4.6pp
Young workforce (25 to 34)
+975
+1.0pp
Parents and homebuilders (35 to 49)
+2,019
+13.2pp
Older workers and pre-retirees (50 to 59)
+1,430
-2.1pp
Empty nesters and retirees (60 to 69)
+1,286
-11.1pp
Seniors (70 to 84)
+1,252
+0.9pp
Elderly aged (85 and over)
+162
+1.6pp
Data table
Service age groups for Flagstaff Hill. Age structure - Service 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 | |
| Babies and pre-schoolers (0 to 4) | 519 | 5.1% | 5.4% | 0 | 0.0% | 6.2% | +519 | +5.1pp |
| Primary schoolers (5 to 11) | 848 | 8.3% | 8.6% | 7 | 6.7% | 8.9% | +841 | +1.6pp |
| Secondary schoolers (12 to 17) | 792 | 7.8% | 7.3% | 3 | 2.9% | 7.5% | +789 | +4.9pp |
| Tertiary education and independence (18 to 24) | 853 | 8.4% | 7.9% | 4 | 3.8% | 8.4% | +849 | +4.6pp |
| Young workforce (25 to 34) | 984 | 9.7% | 12.2% | 9 | 8.7% | 12.4% | +975 | +1.0pp |
| Parents and homebuilders (35 to 49) | 2,026 | 19.9% | 19.2% | 7 | 6.7% | 19.7% | +2,019 | +13.2pp |
| Older workers and pre-retirees (50 to 59) | 1,447 | 14.2% | 13.1% | 17 | 16.3% | 13.3% | +1,430 | -2.1pp |
| Empty nesters and retirees (60 to 69) | 1,311 | 12.9% | 12.3% | 25 | 24.0% | 12.4% | +1,286 | -11.1pp |
| Seniors (70 to 84) | 1,264 | 12.4% | 11.8% | 12 | 11.5% | 9.1% | +1,252 | +0.9pp |
| Elderly aged (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 |