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 Marsden Park, accounting for 29.6% (4,319 people). This share was higher than Blacktown (C) (23.4%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which increased by 4,165 people and 12.6 percentage points.
Section overview
Age structure - Service age groups
Marsden Park - Total persons (Usual residence)
This table summarises service age groups for Marsden Park in 2021 for persons, with comparison against Blacktown (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Marsden Park, with comparison markers for Blacktown (C).
Babies and pre-schoolers (0 to 4)
2021 count
1,712
% of total
11.7%
Change from 2016
+5.1pp
1,712
11.7%
+5.1pp
Primary schoolers (5 to 11)
2021 count
2,116
% of total
14.5%
Change from 2016
+7.7pp
2,116
14.5%
+7.7pp
Secondary schoolers (12 to 17)
2021 count
975
% of total
6.7%
Change from 2016
+0.2pp
975
6.7%
+0.2pp
Tertiary education and independence (18 to 24)
2021 count
843
% of total
5.8%
Change from 2016
-2.8pp
843
5.8%
-2.8pp
Young workforce (25 to 34)
2021 count
2,693
% of total
18.4%
Change from 2016
+3.2pp
2,693
18.4%
+3.2pp
Parents and homebuilders (35 to 49)
2021 count
4,319
% of total
29.6%
Change from 2016
+12.6pp
4,319
29.6%
+12.6pp
Older workers and pre-retirees (50 to 59)
2021 count
773
% of total
5.3%
Change from 2016
-5.5pp
773
5.3%
-5.5pp
Empty nesters and retirees (60 to 69)
2021 count
675
% of total
4.6%
Change from 2016
-12.0pp
675
4.6%
-12.0pp
Seniors (70 to 84)
2021 count
480
% of total
3.3%
Change from 2016
-7.9pp
480
3.3%
-7.9pp
Elderly aged (85 and over)
2021 count
26
% of total
0.2%
Change from 2016
-0.7pp
26
0.2%
-0.7pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
+1,652
+5.1pp
Primary schoolers (5 to 11)
+2,054
+7.7pp
Secondary schoolers (12 to 17)
+916
+0.2pp
Tertiary education and independence (18 to 24)
+765
-2.8pp
Young workforce (25 to 34)
+2,555
+3.2pp
Parents and homebuilders (35 to 49)
+4,165
+12.6pp
Older workers and pre-retirees (50 to 59)
+675
-5.5pp
Empty nesters and retirees (60 to 69)
+524
-12.0pp
Seniors (70 to 84)
+378
-7.9pp
Elderly aged (85 and over)
+18
-0.7pp
Data table
Service age groups for Marsden Park. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Blacktown (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Blacktown (C)% | Count | % | Blacktown (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 1,712 | 11.7% | 7.5% | 60 | 6.6% | 8.0% | +1,652 | +5.1pp |
| Primary schoolers (5 to 11) | 2,116 | 14.5% | 10.9% | 62 | 6.8% | 10.8% | +2,054 | +7.7pp |
| Secondary schoolers (12 to 17) | 975 | 6.7% | 8.0% | 59 | 6.5% | 8.2% | +916 | +0.2pp |
| Tertiary education and independence (18 to 24) | 843 | 5.8% | 9.1% | 78 | 8.6% | 9.5% | +765 | -2.8pp |
| Young workforce (25 to 34) | 2,693 | 18.4% | 14.9% | 138 | 15.2% | 15.5% | +2,555 | +3.2pp |
| Parents and homebuilders (35 to 49) | 4,319 | 29.6% | 23.4% | 154 | 17.0% | 21.7% | +4,165 | +12.6pp |
| Older workers and pre-retirees (50 to 59) | 773 | 5.3% | 10.7% | 98 | 10.8% | 11.4% | +675 | -5.5pp |
| Empty nesters and retirees (60 to 69) | 675 | 4.6% | 8.2% | 151 | 16.6% | 8.4% | +524 | -12.0pp |
| Seniors (70 to 84) | 480 | 3.3% | 6.2% | 102 | 11.2% | 5.4% | +378 | -7.9pp |
| Elderly aged (85 and over) | 26 | 0.2% | 1.1% | 8 | 0.9% | 1.1% | +18 | -0.7pp |
| Total | 14,610 | 100.0% | 100.0% | 909 | 100.0% | 100.0% | +13,701 | 0.0pp |