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 Derwent Valley (M), accounting for 18.7% (2,051 people). This share was higher than Regional Tas. (17%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 181 people and 0.8 percentage points.
Section overview
Age structure - Service age groups
Derwent Valley (M) - Total persons (Usual residence)
This table summarises service age groups for Derwent Valley (M) in 2021 for persons, with comparison against Regional Tas. and change since 2016.
Chart view
Age structure - Service age groups snapshot
2021 distribution by category for Derwent Valley (M), with comparison markers for Regional Tas..
Babies and pre-schoolers (0 to 4)
2021 count
556
% of total
5.1%
Change from 2016
-0.3pp
556
5.1%
-0.3pp
Primary schoolers (5 to 11)
2021 count
924
% of total
8.4%
Change from 2016
-1.0pp
924
8.4%
-1.0pp
Secondary schoolers (12 to 17)
2021 count
882
% of total
8.1%
Change from 2016
+0.5pp
882
8.1%
+0.5pp
Tertiary education and independence (18 to 24)
2021 count
878
% of total
8.0%
Change from 2016
+1.0pp
878
8.0%
+1.0pp
Young workforce (25 to 34)
2021 count
1,221
% of total
11.2%
Change from 2016
+0.7pp
1,221
11.2%
+0.7pp
Parents and homebuilders (35 to 49)
2021 count
2,051
% of total
18.7%
Change from 2016
0.0pp
2,051
18.7%
0.0pp
Older workers and pre-retirees (50 to 59)
2021 count
1,547
% of total
14.1%
Change from 2016
-1.5pp
1,547
14.1%
-1.5pp
Empty nesters and retirees (60 to 69)
2021 count
1,436
% of total
13.1%
Change from 2016
-0.6pp
1,436
13.1%
-0.6pp
Seniors (70 to 84)
2021 count
1,216
% of total
11.1%
Change from 2016
+0.8pp
1,216
11.1%
+0.8pp
Elderly aged (85 and over)
2021 count
197
% of total
1.8%
Change from 2016
+0.2pp
197
1.8%
+0.2pp
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+11
-0.3pp
Primary schoolers (5 to 11)
-16
-1.0pp
Secondary schoolers (12 to 17)
+116
+0.5pp
Tertiary education and independence (18 to 24)
+174
+1.0pp
Young workforce (25 to 34)
+166
+0.7pp
Parents and homebuilders (35 to 49)
+179
0.0pp
Older workers and pre-retirees (50 to 59)
-17
-1.5pp
Empty nesters and retirees (60 to 69)
+64
-0.6pp
Seniors (70 to 84)
+181
+0.8pp
Elderly aged (85 and over)
+41
+0.2pp
Data table
Service age groups for Derwent Valley (M). Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Regional Tas..
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Regional Tas.% | Count | % | Regional Tas.% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 556 | 5.1% | 5.0% | 545 | 5.4% | 5.4% | +11 | -0.3pp |
| Primary schoolers (5 to 11) | 924 | 8.4% | 7.8% | 940 | 9.4% | 8.5% | -16 | -1.0pp |
| Secondary schoolers (12 to 17) | 882 | 8.1% | 7.1% | 766 | 7.6% | 7.3% | +116 | +0.5pp |
| Tertiary education and independence (18 to 24) | 878 | 8.0% | 7.2% | 704 | 7.0% | 7.8% | +174 | +1.0pp |
| Young workforce (25 to 34) | 1,221 | 11.2% | 11.9% | 1,055 | 10.5% | 10.2% | +166 | +0.7pp |
| Parents and homebuilders (35 to 49) | 2,051 | 18.7% | 17.0% | 1,872 | 18.7% | 18.1% | +179 | 0.0pp |
| Older workers and pre-retirees (50 to 59) | 1,547 | 14.1% | 13.9% | 1,564 | 15.6% | 14.8% | -17 | -1.5pp |
| Empty nesters and retirees (60 to 69) | 1,436 | 13.1% | 14.4% | 1,372 | 13.7% | 14.2% | +64 | -0.6pp |
| Seniors (70 to 84) | 1,216 | 11.1% | 13.4% | 1,035 | 10.3% | 11.3% | +181 | +0.8pp |
| Elderly aged (85 and over) | 197 | 1.8% | 2.4% | 156 | 1.6% | 2.3% | +41 | +0.2pp |
| Total | 10,942 | 100.0% | 100.0% | 10,021 | 100.0% | 100.0% | +921 | 0.0pp |