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 Mortdale, accounting for 22.6% (2,431 people). This share was higher than Georges River (A) (19.9%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which increased by 965 people and 5.5 percentage points.
Section overview
Age structure - Service age groups
Mortdale - Total persons (Usual residence)
This table summarises service age groups for Mortdale in 2021 for persons, with comparison against Georges River (A) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Mortdale, with comparison markers for Georges River (A).
Babies and pre-schoolers (0 to 4)
2021 count
626
% of total
5.8%
Change from 2016
+0.1pp
626
5.8%
+0.1pp
Primary schoolers (5 to 11)
2021 count
885
% of total
8.2%
Change from 2016
-0.6pp
885
8.2%
-0.6pp
Secondary schoolers (12 to 17)
2021 count
628
% of total
5.8%
Change from 2016
-3.3pp
628
5.8%
-3.3pp
Tertiary education and independence (18 to 24)
2021 count
917
% of total
8.5%
Change from 2016
+1.6pp
917
8.5%
+1.6pp
Young workforce (25 to 34)
2021 count
1,610
% of total
15.0%
Change from 2016
+4.3pp
1,610
15.0%
+4.3pp
Parents and homebuilders (35 to 49)
2021 count
2,431
% of total
22.6%
Change from 2016
+5.5pp
2,431
22.6%
+5.5pp
Older workers and pre-retirees (50 to 59)
2021 count
1,348
% of total
12.5%
Change from 2016
-0.7pp
1,348
12.5%
-0.7pp
Empty nesters and retirees (60 to 69)
2021 count
1,134
% of total
10.6%
Change from 2016
-2.3pp
1,134
10.6%
-2.3pp
Seniors (70 to 84)
2021 count
881
% of total
8.2%
Change from 2016
-4.7pp
881
8.2%
-4.7pp
Elderly aged (85 and over)
2021 count
279
% of total
2.6%
Change from 2016
-0.1pp
279
2.6%
-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)
+138
+0.1pp
Primary schoolers (5 to 11)
+126
-0.6pp
Secondary schoolers (12 to 17)
-149
-3.3pp
Tertiary education and independence (18 to 24)
+327
+1.6pp
Young workforce (25 to 34)
+691
+4.3pp
Parents and homebuilders (35 to 49)
+965
+5.5pp
Older workers and pre-retirees (50 to 59)
+214
-0.7pp
Empty nesters and retirees (60 to 69)
+26
-2.3pp
Seniors (70 to 84)
-224
-4.7pp
Elderly aged (85 and over)
+51
-0.1pp
Data table
Service age groups for Mortdale. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Georges River (A).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Georges River (A)% | Count | % | Georges River (A)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 626 | 5.8% | 5.0% | 488 | 5.7% | 5.8% | +138 | +0.1pp |
| Primary schoolers (5 to 11) | 885 | 8.2% | 7.7% | 759 | 8.8% | 7.7% | +126 | -0.6pp |
| Secondary schoolers (12 to 17) | 628 | 5.8% | 6.3% | 777 | 9.1% | 6.6% | -149 | -3.3pp |
| Tertiary education and independence (18 to 24) | 917 | 8.5% | 9.8% | 590 | 6.9% | 10.2% | +327 | +1.6pp |
| Young workforce (25 to 34) | 1,610 | 15.0% | 15.5% | 919 | 10.7% | 16.6% | +691 | +4.3pp |
| Parents and homebuilders (35 to 49) | 2,431 | 22.6% | 19.9% | 1,466 | 17.1% | 19.6% | +965 | +5.5pp |
| Older workers and pre-retirees (50 to 59) | 1,348 | 12.5% | 12.6% | 1,134 | 13.2% | 12.8% | +214 | -0.7pp |
| Empty nesters and retirees (60 to 69) | 1,134 | 10.6% | 10.8% | 1,108 | 12.9% | 9.7% | +26 | -2.3pp |
| Seniors (70 to 84) | 881 | 8.2% | 9.6% | 1,105 | 12.9% | 8.3% | -224 | -4.7pp |
| Elderly aged (85 and over) | 279 | 2.6% | 2.8% | 228 | 2.7% | 2.6% | +51 | -0.1pp |
| Total | 10,745 | 100.0% | 100.0% | 8,579 | 100.0% | 100.0% | +2,166 | 0.0pp |