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, Empty nesters and retirees (60 to 69) was the most common category among residents in St Lawrence, accounting for 17.6% (43 people). This share was higher than Isaac (R) (7.4%). Since 2016, the biggest change was in Empty nesters and retirees (60 to 69), which increased by 43 people and 17.6 percentage points.
Section overview
Age structure - Service age groups
St Lawrence - Total persons (Usual residence)
This table summarises service age groups for St Lawrence in 2021 for persons, with comparison against Isaac (R) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for St Lawrence, with comparison markers for Isaac (R).
Babies and pre-schoolers (0 to 4)
2021 count
12
% of total
4.9%
Change from 2016
+4.9pp
12
4.9%
+4.9pp
Primary schoolers (5 to 11)
2021 count
15
% of total
6.1%
Change from 2016
+6.1pp
15
6.1%
+6.1pp
Secondary schoolers (12 to 17)
2021 count
15
% of total
6.1%
Change from 2016
+6.1pp
15
6.1%
+6.1pp
Tertiary education and independence (18 to 24)
2021 count
12
% of total
4.9%
Change from 2016
+4.9pp
12
4.9%
+4.9pp
Young workforce (25 to 34)
2021 count
19
% of total
7.8%
Change from 2016
+7.8pp
19
7.8%
+7.8pp
Parents and homebuilders (35 to 49)
2021 count
19
% of total
7.8%
Change from 2016
+7.8pp
19
7.8%
+7.8pp
Older workers and pre-retirees (50 to 59)
2021 count
37
% of total
15.1%
Change from 2016
+15.1pp
37
15.1%
+15.1pp
Empty nesters and retirees (60 to 69)
2021 count
43
% of total
17.6%
Change from 2016
+17.6pp
43
17.6%
+17.6pp
Seniors (70 to 84)
2021 count
37
% of total
15.1%
Change from 2016
+15.1pp
37
15.1%
+15.1pp
Elderly aged (85 and over)
2021 count
8
% of total
3.3%
Change from 2016
+3.3pp
8
3.3%
+3.3pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+12
+4.9pp
Primary schoolers (5 to 11)
+15
+6.1pp
Secondary schoolers (12 to 17)
+15
+6.1pp
Tertiary education and independence (18 to 24)
+12
+4.9pp
Young workforce (25 to 34)
+19
+7.8pp
Parents and homebuilders (35 to 49)
+19
+7.8pp
Older workers and pre-retirees (50 to 59)
+37
+15.1pp
Empty nesters and retirees (60 to 69)
+43
+17.6pp
Seniors (70 to 84)
+37
+15.1pp
Elderly aged (85 and over)
+8
+3.3pp
Data table
Service age groups for St Lawrence. 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) | 12 | 4.9% | 7.2% | 0 | 0.0% | 9.7% | +12 | +4.9pp |
| Primary schoolers (5 to 11) | 15 | 6.1% | 10.7% | 0 | 0.0% | 12.1% | +15 | +6.1pp |
| Secondary schoolers (12 to 17) | 15 | 6.1% | 6.3% | 0 | 0.0% | 6.7% | +15 | +6.1pp |
| Tertiary education and independence (18 to 24) | 12 | 4.9% | 8.8% | 0 | 0.0% | 7.8% | +12 | +4.9pp |
| Young workforce (25 to 34) | 19 | 7.8% | 18.8% | 0 | 0.0% | 19.1% | +19 | +7.8pp |
| Parents and homebuilders (35 to 49) | 19 | 7.8% | 23.7% | 0 | 0.0% | 23.2% | +19 | +7.8pp |
| Older workers and pre-retirees (50 to 59) | 37 | 15.1% | 13.2% | 0 | 0.0% | 12.2% | +37 | +15.1pp |
| Empty nesters and retirees (60 to 69) | 43 | 17.6% | 7.4% | 0 | 0.0% | 6.3% | +43 | +17.6pp |
| Seniors (70 to 84) | 37 | 15.1% | 3.6% | 0 | 0.0% | 2.6% | +37 | +15.1pp |
| Elderly aged (85 and over) | 8 | 3.3% | 0.5% | 0 | 0.0% | 0.4% | +8 | +3.3pp |
| Total | 245 | 100.0% | 100.0% | 6 | 100.0% | 100.0% | +239 | 0.0pp |