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 Bonnyrigg Heights, accounting for 17.3% (1,278 people). This share was lower than Fairfield (C) (18.4%). Since 2016, the biggest change was in Seniors (70 to 84), which increased by 189 people and 2.6 percentage points.
Section overview
Age structure - Service age groups
Bonnyrigg Heights - Total persons (Usual residence)
This table summarises service age groups for Bonnyrigg Heights in 2021 for persons, with comparison against Fairfield (C) and change since 2016.
Age structure - Service age groups snapshot
2021 distribution by category for Bonnyrigg Heights, with comparison markers for Fairfield (C).
Babies and pre-schoolers (0 to 4)
2021 count
345
% of total
4.7%
Change from 2016
-0.5pp
345
4.7%
-0.5pp
Primary schoolers (5 to 11)
2021 count
611
% of total
8.3%
Change from 2016
-1.5pp
611
8.3%
-1.5pp
Secondary schoolers (12 to 17)
2021 count
658
% of total
8.9%
Change from 2016
-0.1pp
658
8.9%
-0.1pp
Tertiary education and independence (18 to 24)
2021 count
764
% of total
10.4%
Change from 2016
-1.4pp
764
10.4%
-1.4pp
Young workforce (25 to 34)
2021 count
1,019
% of total
13.8%
Change from 2016
+0.1pp
1,019
13.8%
+0.1pp
Parents and homebuilders (35 to 49)
2021 count
1,278
% of total
17.3%
Change from 2016
-1.9pp
1,278
17.3%
-1.9pp
Older workers and pre-retirees (50 to 59)
2021 count
1,054
% of total
14.3%
Change from 2016
-0.5pp
1,054
14.3%
-0.5pp
Empty nesters and retirees (60 to 69)
2021 count
968
% of total
13.1%
Change from 2016
+2.4pp
968
13.1%
+2.4pp
Seniors (70 to 84)
2021 count
594
% of total
8.1%
Change from 2016
+2.6pp
594
8.1%
+2.6pp
Elderly aged (85 and over)
2021 count
85
% of total
1.2%
Change from 2016
+0.5pp
85
1.2%
+0.5pp
Chart view
Age structure - Service age groups change
Absolute change in category counts between 2016 and 2021.
Babies and pre-schoolers (0 to 4)
-33
-0.5pp
Primary schoolers (5 to 11)
-102
-1.5pp
Secondary schoolers (12 to 17)
+2
-0.1pp
Tertiary education and independence (18 to 24)
-99
-1.4pp
Young workforce (25 to 34)
+18
+0.1pp
Parents and homebuilders (35 to 49)
-121
-1.9pp
Older workers and pre-retirees (50 to 59)
-28
-0.5pp
Empty nesters and retirees (60 to 69)
+183
+2.4pp
Seniors (70 to 84)
+189
+2.6pp
Elderly aged (85 and over)
+33
+0.5pp
Data table
Service age groups for Bonnyrigg Heights. Age structure - Service age groups. 2021 and 2016 counts, percentages, and change compared with Fairfield (C).
| Category | 2021 | 2016 | Change | |||||
|---|---|---|---|---|---|---|---|---|
| Count | % | Fairfield (C)% | Count | % | Fairfield (C)% | Count | pp | |
| Babies and pre-schoolers (0 to 4) | 345 | 4.7% | 5.2% | 378 | 5.2% | 6.1% | -33 | -0.5pp |
| Primary schoolers (5 to 11) | 611 | 8.3% | 8.6% | 713 | 9.8% | 9.0% | -102 | -1.5pp |
| Secondary schoolers (12 to 17) | 658 | 8.9% | 8.2% | 656 | 9.0% | 8.2% | +2 | -0.1pp |
| Tertiary education and independence (18 to 24) | 764 | 10.4% | 9.9% | 863 | 11.8% | 10.7% | -99 | -1.4pp |
| Young workforce (25 to 34) | 1,019 | 13.8% | 13.0% | 1,001 | 13.7% | 13.6% | +18 | +0.1pp |
| Parents and homebuilders (35 to 49) | 1,278 | 17.3% | 18.4% | 1,399 | 19.2% | 19.3% | -121 | -1.9pp |
| Older workers and pre-retirees (50 to 59) | 1,054 | 14.3% | 13.4% | 1,082 | 14.8% | 13.6% | -28 | -0.5pp |
| Empty nesters and retirees (60 to 69) | 968 | 13.1% | 12.1% | 785 | 10.7% | 10.3% | +183 | +2.4pp |
| Seniors (70 to 84) | 594 | 8.1% | 9.2% | 405 | 5.5% | 7.4% | +189 | +2.6pp |
| Elderly aged (85 and over) | 85 | 1.2% | 2.1% | 52 | 0.7% | 1.8% | +33 | +0.5pp |
| Total | 7,369 | 100.0% | 100.0% | 7,303 | 100.0% | 100.0% | +66 | 0.0pp |