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 Kooyong, accounting for 15.6% (131 people). This share was lower than Stonnington (C) (20.2%). Since 2016, the biggest change was in Young workforce (25 to 34), which increased by 39 people and 4.3 percentage points.
Section overview
Age structure - Service age groups
Kooyong - Total persons (Usual residence)
This table summarises service age groups for Kooyong in 2021 for persons, with comparison against Stonnington (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Kooyong, with comparison markers for Stonnington (C).
Babies and pre-schoolers (0 to 4)
2021 count
33
% of total
3.9%
Change from 2016
+2.3pp
33
3.9%
+2.3pp
Primary schoolers (5 to 11)
2021 count
48
% of total
5.7%
Change from 2016
-1.8pp
48
5.7%
-1.8pp
Secondary schoolers (12 to 17)
2021 count
64
% of total
7.6%
Change from 2016
-1.3pp
64
7.6%
-1.3pp
Tertiary education and independence (18 to 24)
2021 count
98
% of total
11.6%
Change from 2016
+0.8pp
98
11.6%
+0.8pp
Young workforce (25 to 34)
2021 count
113
% of total
13.4%
Change from 2016
+4.3pp
113
13.4%
+4.3pp
Parents and homebuilders (35 to 49)
2021 count
131
% of total
15.6%
Change from 2016
-3.0pp
131
15.6%
-3.0pp
Older workers and pre-retirees (50 to 59)
2021 count
128
% of total
15.2%
Change from 2016
+3.6pp
128
15.2%
+3.6pp
Empty nesters and retirees (60 to 69)
2021 count
92
% of total
10.9%
Change from 2016
-2.3pp
92
10.9%
-2.3pp
Seniors (70 to 84)
2021 count
124
% of total
14.7%
Change from 2016
+2.0pp
124
14.7%
+2.0pp
Elderly aged (85 and over)
2021 count
36
% of total
4.3%
Change from 2016
+1.2pp
36
4.3%
+1.2pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+20
+2.3pp
Primary schoolers (5 to 11)
-13
-1.8pp
Secondary schoolers (12 to 17)
-9
-1.3pp
Tertiary education and independence (18 to 24)
+10
+0.8pp
Young workforce (25 to 34)
+39
+4.3pp
Parents and homebuilders (35 to 49)
-21
-3.0pp
Older workers and pre-retirees (50 to 59)
+33
+3.6pp
Empty nesters and retirees (60 to 69)
-16
-2.3pp
Seniors (70 to 84)
+20
+2.0pp
Elderly aged (85 and over)
+11
+1.2pp
Data table
Service age groups for Kooyong. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Stonnington (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Stonnington (C)% | Count | % | Stonnington (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 33 | 3.9% | 3.8% | 13 | 1.6% | 4.2% | +20 | +2.3pp |
| Primary schoolers (5 to 11) | 48 | 5.7% | 5.2% | 61 | 7.5% | 5.8% | -13 | -1.8pp |
| Secondary schoolers (12 to 17) | 64 | 7.6% | 5.0% | 73 | 8.9% | 4.8% | -9 | -1.3pp |
| Tertiary education and independence (18 to 24) | 98 | 11.6% | 9.7% | 88 | 10.8% | 11.3% | +10 | +0.8pp |
| Young workforce (25 to 34) | 113 | 13.4% | 22.7% | 74 | 9.1% | 23.8% | +39 | +4.3pp |
| Parents and homebuilders (35 to 49) | 131 | 15.6% | 20.2% | 152 | 18.6% | 19.8% | -21 | -3.0pp |
| Older workers and pre-retirees (50 to 59) | 128 | 15.2% | 11.6% | 95 | 11.6% | 10.6% | +33 | +3.6pp |
| Empty nesters and retirees (60 to 69) | 92 | 10.9% | 9.2% | 108 | 13.2% | 9.0% | -16 | -2.3pp |
| Seniors (70 to 84) | 124 | 14.7% | 10.0% | 104 | 12.7% | 8.4% | +20 | +2.0pp |
| Elderly aged (85 and over) | 36 | 4.3% | 2.6% | 25 | 3.1% | 2.4% | +11 | +1.2pp |
| Total | 842 | 100.0% | 100.0% | 817 | 100.0% | 100.0% | +25 | 0.0pp |