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 Middlemount, accounting for 25.9% (491 people). This share was higher than Isaac (R) (23.7%). Since 2016, the biggest change was in Primary schoolers (5 to 11), which decreased by 150 people and 5.5 percentage points.
Section overview
Age structure - Service age groups
Middlemount - Total persons (Usual residence)
This table summarises service age groups for Middlemount in 2021 for persons, with comparison against Isaac (R) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Middlemount, with comparison markers for Isaac (R).
Babies and pre-schoolers (0 to 4)
2021 count
157
% of total
8.3%
Change from 2016
-1.5pp
157
8.3%
-1.5pp
Primary schoolers (5 to 11)
2021 count
170
% of total
9.0%
Change from 2016
-5.5pp
170
9.0%
-5.5pp
Secondary schoolers (12 to 17)
2021 count
101
% of total
5.3%
Change from 2016
-4.1pp
101
5.3%
-4.1pp
Tertiary education and independence (18 to 24)
2021 count
191
% of total
10.1%
Change from 2016
+4.1pp
191
10.1%
+4.1pp
Young workforce (25 to 34)
2021 count
445
% of total
23.4%
Change from 2016
+7.5pp
445
23.4%
+7.5pp
Parents and homebuilders (35 to 49)
2021 count
491
% of total
25.9%
Change from 2016
+4.4pp
491
25.9%
+4.4pp
Older workers and pre-retirees (50 to 59)
2021 count
257
% of total
13.5%
Change from 2016
+2.0pp
257
13.5%
+2.0pp
Empty nesters and retirees (60 to 69)
2021 count
88
% of total
4.6%
Change from 2016
-3.5pp
88
4.6%
-3.5pp
Seniors (70 to 84)
2021 count
0
% of total
0.0%
Change from 2016
-4.3pp
0
0.0%
-4.3pp
Elderly aged (85 and over)
2021 count
0
% of total
0.0%
Change from 2016
-0.1pp
0
0.0%
-0.1pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-60
-1.5pp
Primary schoolers (5 to 11)
-150
-5.5pp
Secondary schoolers (12 to 17)
-107
-4.1pp
Tertiary education and independence (18 to 24)
+58
+4.1pp
Young workforce (25 to 34)
+94
+7.5pp
Parents and homebuilders (35 to 49)
+15
+4.4pp
Older workers and pre-retirees (50 to 59)
+3
+2.0pp
Empty nesters and retirees (60 to 69)
-90
-3.5pp
Seniors (70 to 84)
-94
-4.3pp
Elderly aged (85 and over)
-3
-0.1pp
Data table
Service age groups for Middlemount. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Isaac (R).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Isaac (R)% | Count | % | Isaac (R)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 157 | 8.3% | 7.2% | 217 | 9.8% | 9.7% | -60 | -1.5pp |
| Primary schoolers (5 to 11) | 170 | 9.0% | 10.7% | 320 | 14.5% | 12.1% | -150 | -5.5pp |
| Secondary schoolers (12 to 17) | 101 | 5.3% | 6.3% | 208 | 9.4% | 6.7% | -107 | -4.1pp |
| Tertiary education and independence (18 to 24) | 191 | 10.1% | 8.8% | 133 | 6.0% | 7.8% | +58 | +4.1pp |
| Young workforce (25 to 34) | 445 | 23.4% | 18.8% | 351 | 15.9% | 19.1% | +94 | +7.5pp |
| Parents and homebuilders (35 to 49) | 491 | 25.9% | 23.7% | 476 | 21.5% | 23.2% | +15 | +4.4pp |
| Older workers and pre-retirees (50 to 59) | 257 | 13.5% | 13.2% | 254 | 11.5% | 12.2% | +3 | +2.0pp |
| Empty nesters and retirees (60 to 69) | 88 | 4.6% | 7.4% | 178 | 8.1% | 6.3% | -90 | -3.5pp |
| Seniors (70 to 84) | 0 | 0.0% | 3.6% | 94 | 4.3% | 2.6% | -94 | -4.3pp |
| Elderly aged (85 and over) | 0 | 0.0% | 0.5% | 3 | 0.1% | 0.4% | -3 | -0.1pp |
| Total | 1,899 | 100.0% | 100.0% | 2,211 | 100.0% | 100.0% | -312 | 0.0pp |