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 Seaford (Vic.), accounting for 23% (3,966 people). This share was higher than Frankston (C) (21%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which increased by 3,966 people and 23 percentage points.
Section overview
Age structure - Service age groups
Seaford (Vic.) - Total persons (Usual residence)
This table summarises service age groups for Seaford (Vic.) in 2021 for persons, with comparison against Frankston (C) and change since 2016.
Chart view
Age structure - Service age groups snapshot
2021 distribution by category for Seaford (Vic.), with comparison markers for Frankston (C).
Babies and pre-schoolers (0 to 4)
2021 count
1,179
% of total
6.8%
Change from 2016
+6.8pp
1,179
6.8%
+6.8pp
Primary schoolers (5 to 11)
2021 count
1,367
% of total
7.9%
Change from 2016
+7.9pp
1,367
7.9%
+7.9pp
Secondary schoolers (12 to 17)
2021 count
976
% of total
5.7%
Change from 2016
+5.7pp
976
5.7%
+5.7pp
Tertiary education and independence (18 to 24)
2021 count
1,100
% of total
6.4%
Change from 2016
+6.4pp
1,100
6.4%
+6.4pp
Young workforce (25 to 34)
2021 count
2,365
% of total
13.7%
Change from 2016
+13.7pp
2,365
13.7%
+13.7pp
Parents and homebuilders (35 to 49)
2021 count
3,966
% of total
23.0%
Change from 2016
+23.0pp
3,966
23.0%
+23.0pp
Older workers and pre-retirees (50 to 59)
2021 count
2,164
% of total
12.6%
Change from 2016
+12.6pp
2,164
12.6%
+12.6pp
Empty nesters and retirees (60 to 69)
2021 count
1,918
% of total
11.1%
Change from 2016
-25.7pp
1,918
11.1%
-25.7pp
Seniors (70 to 84)
2021 count
1,828
% of total
10.6%
Change from 2016
+10.6pp
1,828
10.6%
+10.6pp
Elderly aged (85 and over)
2021 count
380
% of total
2.2%
Change from 2016
+2.2pp
380
2.2%
+2.2pp
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+1,179
+6.8pp
Primary schoolers (5 to 11)
+1,367
+7.9pp
Secondary schoolers (12 to 17)
+976
+5.7pp
Tertiary education and independence (18 to 24)
+1,100
+6.4pp
Young workforce (25 to 34)
+2,365
+13.7pp
Parents and homebuilders (35 to 49)
+3,966
+23.0pp
Older workers and pre-retirees (50 to 59)
+2,164
+12.6pp
Empty nesters and retirees (60 to 69)
+1,911
-25.7pp
Seniors (70 to 84)
+1,828
+10.6pp
Elderly aged (85 and over)
+380
+2.2pp
Data table
Service age groups for Seaford (Vic.). Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Frankston (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Frankston (C)% | Count | % | Frankston (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 1,179 | 6.8% | 6.2% | 0 | 0.0% | 6.7% | +1,179 | +6.8pp |
| Primary schoolers (5 to 11) | 1,367 | 7.9% | 8.7% | 0 | 0.0% | 8.6% | +1,367 | +7.9pp |
| Secondary schoolers (12 to 17) | 976 | 5.7% | 7.1% | 0 | 0.0% | 6.9% | +976 | +5.7pp |
| Tertiary education and independence (18 to 24) | 1,100 | 6.4% | 7.7% | 0 | 0.0% | 8.7% | +1,100 | +6.4pp |
| Young workforce (25 to 34) | 2,365 | 13.7% | 13.7% | 0 | 0.0% | 13.8% | +2,365 | +13.7pp |
| Parents and homebuilders (35 to 49) | 3,966 | 23.0% | 21.0% | 0 | 0.0% | 21.1% | +3,966 | +23.0pp |
| Older workers and pre-retirees (50 to 59) | 2,164 | 12.6% | 13.0% | 0 | 0.0% | 13.3% | +2,164 | +12.6pp |
| Empty nesters and retirees (60 to 69) | 1,918 | 11.1% | 10.8% | 7 | 36.8% | 10.5% | +1,911 | -25.7pp |
| Seniors (70 to 84) | 1,828 | 10.6% | 9.6% | 0 | 0.0% | 8.4% | +1,828 | +10.6pp |
| Elderly aged (85 and over) | 380 | 2.2% | 2.2% | 0 | 0.0% | 2.0% | +380 | +2.2pp |
| Total | 17,215 | 100.0% | 100.0% | 19 | 100.0% | 100.0% | +17,196 | 0.0pp |