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 Riverstone, accounting for 22.3% (1,921 people). This share was lower than Blacktown (C) (23.4%). Since 2016, the biggest change was in Parents and homebuilders (35 to 49), which increased by 662 people and 0.9 percentage points.
Section overview
Age structure - Service age groups
Riverstone - Total persons (Usual residence)
This table summarises service age groups for Riverstone in 2021 for persons, with comparison against Blacktown (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Riverstone, with comparison markers for Blacktown (C).
Babies and pre-schoolers (0 to 4)
2021 count
822
% of total
9.5%
Change from 2016
+2.1pp
822
9.5%
+2.1pp
Primary schoolers (5 to 11)
2021 count
937
% of total
10.9%
Change from 2016
+0.8pp
937
10.9%
+0.8pp
Secondary schoolers (12 to 17)
2021 count
631
% of total
7.3%
Change from 2016
-1.1pp
631
7.3%
-1.1pp
Tertiary education and independence (18 to 24)
2021 count
765
% of total
8.9%
Change from 2016
+0.1pp
765
8.9%
+0.1pp
Young workforce (25 to 34)
2021 count
1,556
% of total
18.0%
Change from 2016
+1.8pp
1,556
18.0%
+1.8pp
Parents and homebuilders (35 to 49)
2021 count
1,921
% of total
22.3%
Change from 2016
+0.9pp
1,921
22.3%
+0.9pp
Older workers and pre-retirees (50 to 59)
2021 count
850
% of total
9.9%
Change from 2016
-1.5pp
850
9.9%
-1.5pp
Empty nesters and retirees (60 to 69)
2021 count
609
% of total
7.1%
Change from 2016
-1.5pp
609
7.1%
-1.5pp
Seniors (70 to 84)
2021 count
481
% of total
5.6%
Change from 2016
-1.0pp
481
5.6%
-1.0pp
Elderly aged (85 and over)
2021 count
85
% of total
1.0%
Change from 2016
-0.1pp
85
1.0%
-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)
+385
+2.1pp
Primary schoolers (5 to 11)
+346
+0.8pp
Secondary schoolers (12 to 17)
+137
-1.1pp
Tertiary education and independence (18 to 24)
+249
+0.1pp
Young workforce (25 to 34)
+606
+1.8pp
Parents and homebuilders (35 to 49)
+662
+0.9pp
Older workers and pre-retirees (50 to 59)
+180
-1.5pp
Empty nesters and retirees (60 to 69)
+101
-1.5pp
Seniors (70 to 84)
+93
-1.0pp
Elderly aged (85 and over)
+22
-0.1pp
Data table
Service age groups for Riverstone. 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) | 822 | 9.5% | 7.5% | 437 | 7.4% | 8.0% | +385 | +2.1pp |
| Primary schoolers (5 to 11) | 937 | 10.9% | 10.9% | 591 | 10.1% | 10.8% | +346 | +0.8pp |
| Secondary schoolers (12 to 17) | 631 | 7.3% | 8.0% | 494 | 8.4% | 8.2% | +137 | -1.1pp |
| Tertiary education and independence (18 to 24) | 765 | 8.9% | 9.1% | 516 | 8.8% | 9.5% | +249 | +0.1pp |
| Young workforce (25 to 34) | 1,556 | 18.0% | 14.9% | 950 | 16.2% | 15.5% | +606 | +1.8pp |
| Parents and homebuilders (35 to 49) | 1,921 | 22.3% | 23.4% | 1,259 | 21.4% | 21.7% | +662 | +0.9pp |
| Older workers and pre-retirees (50 to 59) | 850 | 9.9% | 10.7% | 670 | 11.4% | 11.4% | +180 | -1.5pp |
| Empty nesters and retirees (60 to 69) | 609 | 7.1% | 8.2% | 508 | 8.6% | 8.4% | +101 | -1.5pp |
| Seniors (70 to 84) | 481 | 5.6% | 6.2% | 388 | 6.6% | 5.4% | +93 | -1.0pp |
| Elderly aged (85 and over) | 85 | 1.0% | 1.1% | 63 | 1.1% | 1.1% | +22 | -0.1pp |
| Total | 8,627 | 100.0% | 100.0% | 5,877 | 100.0% | 100.0% | +2,750 | 0.0pp |