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 Black Forest, accounting for 19.3% (382 people). This share was lower than Unley (C) (19.6%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 48 people and 2.2 percentage points.
Section overview
Age structure - Service age groups
Black Forest - Total persons (Usual residence)
This table summarises service age groups for Black Forest in 2021 for persons, with comparison against Unley (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Black Forest, with comparison markers for Unley (C).
Babies and pre-schoolers (0 to 4)
2021 count
93
% of total
4.7%
Change from 2016
-0.2pp
93
4.7%
-0.2pp
Primary schoolers (5 to 11)
2021 count
146
% of total
7.4%
Change from 2016
-1.4pp
146
7.4%
-1.4pp
Secondary schoolers (12 to 17)
2021 count
119
% of total
6.0%
Change from 2016
+1.5pp
119
6.0%
+1.5pp
Tertiary education and independence (18 to 24)
2021 count
187
% of total
9.4%
Change from 2016
+0.1pp
187
9.4%
+0.1pp
Young workforce (25 to 34)
2021 count
336
% of total
17.0%
Change from 2016
+0.3pp
336
17.0%
+0.3pp
Parents and homebuilders (35 to 49)
2021 count
382
% of total
19.3%
Change from 2016
-0.4pp
382
19.3%
-0.4pp
Older workers and pre-retirees (50 to 59)
2021 count
258
% of total
13.0%
Change from 2016
-0.6pp
258
13.0%
-0.6pp
Empty nesters and retirees (60 to 69)
2021 count
237
% of total
12.0%
Change from 2016
-1.1pp
237
12.0%
-1.1pp
Seniors (70 to 84)
2021 count
199
% of total
10.0%
Change from 2016
+2.2pp
199
10.0%
+2.2pp
Elderly aged (85 and over)
2021 count
32
% of total
1.6%
Change from 2016
-0.3pp
32
1.6%
-0.3pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-1
-0.2pp
Primary schoolers (5 to 11)
-25
-1.4pp
Secondary schoolers (12 to 17)
+32
+1.5pp
Tertiary education and independence (18 to 24)
+7
+0.1pp
Young workforce (25 to 34)
+14
+0.3pp
Parents and homebuilders (35 to 49)
+1
-0.4pp
Older workers and pre-retirees (50 to 59)
-5
-0.6pp
Empty nesters and retirees (60 to 69)
-17
-1.1pp
Seniors (70 to 84)
+48
+2.2pp
Elderly aged (85 and over)
-5
-0.3pp
Data table
Service age groups for Black Forest. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Unley (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Unley (C)% | Count | % | Unley (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 93 | 4.7% | 4.3% | 94 | 4.9% | 4.7% | -1 | -0.2pp |
| Primary schoolers (5 to 11) | 146 | 7.4% | 7.6% | 171 | 8.8% | 7.9% | -25 | -1.4pp |
| Secondary schoolers (12 to 17) | 119 | 6.0% | 6.9% | 87 | 4.5% | 6.6% | +32 | +1.5pp |
| Tertiary education and independence (18 to 24) | 187 | 9.4% | 8.2% | 180 | 9.3% | 9.4% | +7 | +0.1pp |
| Young workforce (25 to 34) | 336 | 17.0% | 12.4% | 322 | 16.7% | 13.5% | +14 | +0.3pp |
| Parents and homebuilders (35 to 49) | 382 | 19.3% | 19.6% | 381 | 19.7% | 19.8% | +1 | -0.4pp |
| Older workers and pre-retirees (50 to 59) | 258 | 13.0% | 12.6% | 263 | 13.6% | 12.7% | -5 | -0.6pp |
| Empty nesters and retirees (60 to 69) | 237 | 12.0% | 11.9% | 254 | 13.1% | 11.9% | -17 | -1.1pp |
| Seniors (70 to 84) | 199 | 10.0% | 12.2% | 151 | 7.8% | 9.2% | +48 | +2.2pp |
| Elderly aged (85 and over) | 32 | 1.6% | 4.1% | 37 | 1.9% | 4.3% | -5 | -0.3pp |
| Total | 1,982 | 100.0% | 100.0% | 1,933 | 100.0% | 100.0% | +49 | 0.0pp |