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 St Helena, accounting for 18% (520 people). This share was lower than Banyule (C) (21.3%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 137 people and 4.8 percentage points.
Section overview
Age structure - Service age groups
St Helena - Total persons (Usual residence)
This table summarises service age groups for St Helena in 2021 for persons, with comparison against Banyule (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for St Helena, with comparison markers for Banyule (C).
Babies and pre-schoolers (0 to 4)
2021 count
122
% of total
4.2%
Change from 2016
-1.3pp
122
4.2%
-1.3pp
Primary schoolers (5 to 11)
2021 count
286
% of total
9.9%
Change from 2016
+2.2pp
286
9.9%
+2.2pp
Secondary schoolers (12 to 17)
2021 count
202
% of total
7.0%
Change from 2016
-0.6pp
202
7.0%
-0.6pp
Tertiary education and independence (18 to 24)
2021 count
223
% of total
7.7%
Change from 2016
-2.8pp
223
7.7%
-2.8pp
Young workforce (25 to 34)
2021 count
221
% of total
7.6%
Change from 2016
-2.3pp
221
7.6%
-2.3pp
Parents and homebuilders (35 to 49)
2021 count
520
% of total
18.0%
Change from 2016
+0.4pp
520
18.0%
+0.4pp
Older workers and pre-retirees (50 to 59)
2021 count
422
% of total
14.6%
Change from 2016
-2.3pp
422
14.6%
-2.3pp
Empty nesters and retirees (60 to 69)
2021 count
449
% of total
15.5%
Change from 2016
+3.0pp
449
15.5%
+3.0pp
Seniors (70 to 84)
2021 count
353
% of total
12.2%
Change from 2016
+4.8pp
353
12.2%
+4.8pp
Elderly aged (85 and over)
2021 count
112
% of total
3.9%
Change from 2016
0.0pp
112
3.9%
0.0pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-39
-1.3pp
Primary schoolers (5 to 11)
+60
+2.2pp
Secondary schoolers (12 to 17)
-21
-0.6pp
Tertiary education and independence (18 to 24)
-83
-2.8pp
Young workforce (25 to 34)
-69
-2.3pp
Parents and homebuilders (35 to 49)
+5
+0.4pp
Older workers and pre-retirees (50 to 59)
-73
-2.3pp
Empty nesters and retirees (60 to 69)
+83
+3.0pp
Seniors (70 to 84)
+137
+4.8pp
Elderly aged (85 and over)
-3
0.0pp
Data table
Service age groups for St Helena. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Banyule (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Banyule (C)% | Count | % | Banyule (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 122 | 4.2% | 5.6% | 161 | 5.5% | 6.4% | -39 | -1.3pp |
| Primary schoolers (5 to 11) | 286 | 9.9% | 8.6% | 226 | 7.7% | 8.5% | +60 | +2.2pp |
| Secondary schoolers (12 to 17) | 202 | 7.0% | 6.9% | 223 | 7.6% | 6.5% | -21 | -0.6pp |
| Tertiary education and independence (18 to 24) | 223 | 7.7% | 7.7% | 306 | 10.5% | 8.4% | -83 | -2.8pp |
| Young workforce (25 to 34) | 221 | 7.6% | 12.9% | 290 | 9.9% | 13.3% | -69 | -2.3pp |
| Parents and homebuilders (35 to 49) | 520 | 18.0% | 21.3% | 515 | 17.6% | 21.1% | +5 | +0.4pp |
| Older workers and pre-retirees (50 to 59) | 422 | 14.6% | 12.4% | 495 | 16.9% | 12.7% | -73 | -2.3pp |
| Empty nesters and retirees (60 to 69) | 449 | 15.5% | 11.0% | 366 | 12.5% | 11.0% | +83 | +3.0pp |
| Seniors (70 to 84) | 353 | 12.2% | 11.0% | 216 | 7.4% | 9.4% | +137 | +4.8pp |
| Elderly aged (85 and over) | 112 | 3.9% | 2.7% | 115 | 3.9% | 2.7% | -3 | 0.0pp |
| Total | 2,890 | 100.0% | 100.0% | 2,923 | 100.0% | 100.0% | -33 | 0.0pp |