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 North St Marys, accounting for 17.7% (729 people). This share was lower than Penrith (C) (21%). Since 2016, the biggest change was in Young workforce (25 to 34), which increased by 89 people and 1.5 percentage points.
Section overview
Age structure - Service age groups
North St Marys - Total persons (Usual residence)
This table summarises service age groups for North St Marys in 2021 for persons, with comparison against Penrith (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for North St Marys, with comparison markers for Penrith (C).
Babies and pre-schoolers (0 to 4)
2021 count
269
% of total
6.5%
Change from 2016
-1.4pp
269
6.5%
-1.4pp
Primary schoolers (5 to 11)
2021 count
440
% of total
10.7%
Change from 2016
-0.3pp
440
10.7%
-0.3pp
Secondary schoolers (12 to 17)
2021 count
344
% of total
8.3%
Change from 2016
+1.3pp
344
8.3%
+1.3pp
Tertiary education and independence (18 to 24)
2021 count
396
% of total
9.6%
Change from 2016
-1.3pp
396
9.6%
-1.3pp
Young workforce (25 to 34)
2021 count
614
% of total
14.9%
Change from 2016
+1.5pp
614
14.9%
+1.5pp
Parents and homebuilders (35 to 49)
2021 count
729
% of total
17.7%
Change from 2016
-0.8pp
729
17.7%
-0.8pp
Older workers and pre-retirees (50 to 59)
2021 count
494
% of total
12.0%
Change from 2016
0.0pp
494
12.0%
0.0pp
Empty nesters and retirees (60 to 69)
2021 count
342
% of total
8.3%
Change from 2016
-0.5pp
342
8.3%
-0.5pp
Seniors (70 to 84)
2021 count
371
% of total
9.0%
Change from 2016
-0.3pp
371
9.0%
-0.3pp
Elderly aged (85 and over)
2021 count
139
% of total
3.4%
Change from 2016
+1.1pp
139
3.4%
+1.1pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-39
-1.4pp
Primary schoolers (5 to 11)
+9
-0.3pp
Secondary schoolers (12 to 17)
+71
+1.3pp
Tertiary education and independence (18 to 24)
-32
-1.3pp
Young workforce (25 to 34)
+89
+1.5pp
Parents and homebuilders (35 to 49)
+4
-0.8pp
Older workers and pre-retirees (50 to 59)
+23
0.0pp
Empty nesters and retirees (60 to 69)
-4
-0.5pp
Seniors (70 to 84)
+6
-0.3pp
Elderly aged (85 and over)
+48
+1.1pp
Data table
Service age groups for North St Marys. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Penrith (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Penrith (C)% | Count | % | Penrith (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 269 | 6.5% | 7.2% | 308 | 7.9% | 7.4% | -39 | -1.4pp |
| Primary schoolers (5 to 11) | 440 | 10.7% | 9.9% | 431 | 11.0% | 9.8% | +9 | -0.3pp |
| Secondary schoolers (12 to 17) | 344 | 8.3% | 7.8% | 273 | 7.0% | 7.8% | +71 | +1.3pp |
| Tertiary education and independence (18 to 24) | 396 | 9.6% | 9.3% | 428 | 10.9% | 9.9% | -32 | -1.3pp |
| Young workforce (25 to 34) | 614 | 14.9% | 15.2% | 525 | 13.4% | 15.4% | +89 | +1.5pp |
| Parents and homebuilders (35 to 49) | 729 | 17.7% | 21.0% | 725 | 18.5% | 20.5% | +4 | -0.8pp |
| Older workers and pre-retirees (50 to 59) | 494 | 12.0% | 11.4% | 471 | 12.0% | 12.3% | +23 | 0.0pp |
| Empty nesters and retirees (60 to 69) | 342 | 8.3% | 9.5% | 346 | 8.8% | 9.7% | -4 | -0.5pp |
| Seniors (70 to 84) | 371 | 9.0% | 7.5% | 365 | 9.3% | 6.0% | +6 | -0.3pp |
| Elderly aged (85 and over) | 139 | 3.4% | 1.2% | 91 | 2.3% | 1.2% | +48 | +1.1pp |
| Total | 4,123 | 100.0% | 100.0% | 3,921 | 100.0% | 100.0% | +202 | 0.0pp |