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, Older workers and pre-retirees (50 to 59) was the most common category among residents in Chiltern, accounting for 16.3% (258 people). This share was higher than Indigo (S) (15.1%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 93 people and 6 percentage points.
Section overview
Age structure - Service age groups
Chiltern - Total persons (Usual residence)
This table summarises service age groups for Chiltern in 2021 for persons, with comparison against Indigo (S) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Chiltern, with comparison markers for Indigo (S).
Babies and pre-schoolers (0 to 4)
2021 count
67
% of total
4.2%
Change from 2016
-0.7pp
67
4.2%
-0.7pp
Primary schoolers (5 to 11)
2021 count
101
% of total
6.4%
Change from 2016
-2.5pp
101
6.4%
-2.5pp
Secondary schoolers (12 to 17)
2021 count
139
% of total
8.8%
Change from 2016
+1.2pp
139
8.8%
+1.2pp
Tertiary education and independence (18 to 24)
2021 count
112
% of total
7.1%
Change from 2016
+1.1pp
112
7.1%
+1.1pp
Young workforce (25 to 34)
2021 count
134
% of total
8.5%
Change from 2016
+1.1pp
134
8.5%
+1.1pp
Parents and homebuilders (35 to 49)
2021 count
251
% of total
15.9%
Change from 2016
-3.0pp
251
15.9%
-3.0pp
Older workers and pre-retirees (50 to 59)
2021 count
258
% of total
16.3%
Change from 2016
-1.4pp
258
16.3%
-1.4pp
Empty nesters and retirees (60 to 69)
2021 count
255
% of total
16.1%
Change from 2016
-0.8pp
255
16.1%
-0.8pp
Seniors (70 to 84)
2021 count
258
% of total
16.3%
Change from 2016
+6.0pp
258
16.3%
+6.0pp
Elderly aged (85 and over)
2021 count
27
% of total
1.7%
Change from 2016
+0.2pp
27
1.7%
+0.2pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-12
-0.7pp
Primary schoolers (5 to 11)
-42
-2.5pp
Secondary schoolers (12 to 17)
+17
+1.2pp
Tertiary education and independence (18 to 24)
+16
+1.1pp
Young workforce (25 to 34)
+16
+1.1pp
Parents and homebuilders (35 to 49)
-53
-3.0pp
Older workers and pre-retirees (50 to 59)
-26
-1.4pp
Empty nesters and retirees (60 to 69)
-16
-0.8pp
Seniors (70 to 84)
+93
+6.0pp
Elderly aged (85 and over)
+3
+0.2pp
Data table
Service age groups for Chiltern. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Indigo (S).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Indigo (S)% | Count | % | Indigo (S)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 67 | 4.2% | 4.9% | 79 | 4.9% | 4.8% | -12 | -0.7pp |
| Primary schoolers (5 to 11) | 101 | 6.4% | 8.4% | 143 | 8.9% | 8.9% | -42 | -2.5pp |
| Secondary schoolers (12 to 17) | 139 | 8.8% | 8.1% | 122 | 7.6% | 8.0% | +17 | +1.2pp |
| Tertiary education and independence (18 to 24) | 112 | 7.1% | 5.3% | 96 | 6.0% | 5.7% | +16 | +1.1pp |
| Young workforce (25 to 34) | 134 | 8.5% | 8.5% | 118 | 7.4% | 7.9% | +16 | +1.1pp |
| Parents and homebuilders (35 to 49) | 251 | 15.9% | 18.0% | 304 | 18.9% | 19.6% | -53 | -3.0pp |
| Older workers and pre-retirees (50 to 59) | 258 | 16.3% | 15.1% | 284 | 17.7% | 16.4% | -26 | -1.4pp |
| Empty nesters and retirees (60 to 69) | 255 | 16.1% | 15.7% | 271 | 16.9% | 15.8% | -16 | -0.8pp |
| Seniors (70 to 84) | 258 | 16.3% | 13.9% | 165 | 10.3% | 10.8% | +93 | +6.0pp |
| Elderly aged (85 and over) | 27 | 1.7% | 2.3% | 24 | 1.5% | 2.2% | +3 | +0.2pp |
| Total | 1,580 | 100.0% | 100.0% | 1,605 | 100.0% | 100.0% | -25 | 0.0pp |