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 Bayside (NSW), accounting for 21.3% (37,298 people). This share was similar to Greater Sydney (21.5%).
Section overview
Age structure - Service age groups
Bayside (NSW) - Total persons (Usual residence)
This table summarises service age groups for Bayside (NSW) in 2021 for persons, with comparison against Greater Sydney and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Bayside (NSW), with comparison markers for Greater Sydney.
Babies and pre-schoolers (0 to 4)
2021 count
9,984
% of total
5.7%
Change from 2016
-
9,984
5.7%
-
Primary schoolers (5 to 11)
2021 count
11,810
% of total
6.7%
Change from 2016
-
11,810
6.7%
-
Secondary schoolers (12 to 17)
2021 count
9,243
% of total
5.3%
Change from 2016
-
9,243
5.3%
-
Tertiary education and independence (18 to 24)
2021 count
16,932
% of total
9.7%
Change from 2016
-
16,932
9.7%
-
Young workforce (25 to 34)
2021 count
36,529
% of total
20.9%
Change from 2016
-
36,529
20.9%
-
Parents and homebuilders (35 to 49)
2021 count
37,298
% of total
21.3%
Change from 2016
-
37,298
21.3%
-
Older workers and pre-retirees (50 to 59)
2021 count
19,235
% of total
11.0%
Change from 2016
-
19,235
11.0%
-
Empty nesters and retirees (60 to 69)
2021 count
15,222
% of total
8.7%
Change from 2016
-
15,222
8.7%
-
Seniors (70 to 84)
2021 count
15,107
% of total
8.6%
Change from 2016
-
15,107
8.6%
-
Elderly aged (85 and over)
2021 count
3,802
% of total
2.2%
Change from 2016
-
3,802
2.2%
-
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Data table
Service age groups for Bayside (NSW). Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Greater Sydney.
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Greater Sydney% | Count | % | Greater Sydney% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 9,984 | 5.7% | 6.0% | - | - | 6.4% | - | - |
| Primary schoolers (5 to 11) | 11,810 | 6.7% | 8.8% | - | - | 8.8% | - | - |
| Secondary schoolers (12 to 17) | 9,243 | 5.3% | 7.1% | - | - | 6.9% | - | - |
| Tertiary education and independence (18 to 24) | 16,932 | 9.7% | 8.8% | - | - | 9.6% | - | - |
| Young workforce (25 to 34) | 36,529 | 20.9% | 15.5% | - | - | 16.1% | - | - |
| Parents and homebuilders (35 to 49) | 37,298 | 21.3% | 21.5% | - | - | 21.1% | - | - |
| Older workers and pre-retirees (50 to 59) | 19,235 | 11.0% | 12.0% | - | - | 12.2% | - | - |
| Empty nesters and retirees (60 to 69) | 15,222 | 8.7% | 9.8% | - | - | 9.5% | - | - |
| Seniors (70 to 84) | 15,107 | 8.6% | 8.7% | - | - | 7.5% | - | - |
| Elderly aged (85 and over) | 3,802 | 2.2% | 2.0% | - | - | 2.0% | - | - |
| Total | 175,184 | 100.0% | 100.0% | - | - | 100.0% | - | - |