City of Casey
Five year age groups
In 2021, the largest age group in the City of Casey was 35 to 39 year olds. The group that changed the most since 1991 was 35 to 39 year olds, increasing by 21,515 people.
The Age Structure of the City of Casey provides key insights into the level of demand for age based services and facilities such as child care. It is also an indicator of the City of Casey's residential role and function and how it is likely to change in the future.
Five year age groups present a classic age profile of the population. Each age group covers exactly five years, which enables direct comparison between each group.
To get a more complete picture the City of Casey's Age Structure should be viewed in conjunction with Household Types and Dwelling Types.
Derived from the Census question:
'What is the person's date of birth or age?'
Total population
| Age structure - Five year age groups | ||||||||
|---|---|---|---|---|---|---|---|---|
| City of Casey - Total persons (Enumerated) | 2021 | 1991 | Change | |||||
| Five year age groups (years) | Number | % | Mornington Peninsula Shire % | Number | % | Mornington Peninsula Shire % | 1991 to 2021 | |
| 0 to 4 | 27,844 | 7.7 | 4.7 | 11,633 | 10.4 | 8.0 | +16,210 | 2001 |
| 5 to 9 | 28,862 | 7.9 | 5.6 | 10,881 | 9.7 | 7.7 | +17,980 | 2002 |
| 10 to 14 | 26,355 | 7.2 | 6.2 | 9,327 | 8.3 | 7.4 | +17,028 | 2003 |
| 15 to 19 | 23,120 | 6.4 | 5.8 | 8,031 | 7.2 | 7.3 | +15,089 | 2004 |
| 20 to 24 | 24,202 | 6.7 | 4.7 | 8,873 | 7.9 | 6.2 | +15,329 | 2005 |
| 25 to 29 | 26,254 | 7.2 | 4.1 | 11,099 | 9.9 | 6.3 | +15,155 | 2006 |
| 30 to 34 | 29,314 | 8.1 | 4.7 | 11,689 | 10.4 | 7.5 | +17,625 | 2007 |
| 35 to 39 | 31,579 | 8.7 | 5.2 | 10,064 | 9.0 | 7.4 | +21,515 | 2008 |
| 40 to 44 | 26,328 | 7.2 | 5.5 | 8,354 | 7.5 | 7.0 | +17,974 | 2009 |
| 45 to 49 | 23,383 | 6.4 | 6.5 | 5,847 | 5.2 | 5.6 | +17,536 | 2010 |
| 50 to 54 | 21,692 | 6.0 | 7.0 | 4,199 | 3.7 | 4.4 | +17,493 | 2011 |
| 55 to 59 | 19,341 | 5.3 | 6.7 | 3,280 | 2.9 | 4.1 | +16,061 | 2012 |
| 60 to 64 | 16,555 | 4.6 | 6.9 | 2,986 | 2.7 | 5.1 | +13,568 | 2013 |
| 65 to 69 | 12,941 | 3.6 | 6.8 | 2,263 | 2.0 | 5.2 | +10,677 | 2014 |
| 70 to 74 | 10,251 | 2.8 | 6.9 | 1,544 | 1.4 | 4.3 | +8,707 | 2015 |
| 75 to 79 | 6,998 | 1.9 | 5.5 | 1,035 | 0.9 | 3.2 | +5,962 | 2016 |
| 80 to 84 | 4,576 | 1.3 | 3.6 | 586 | 0.5 | 1.9 | +3,990 | 2017 |
| 85 and over | 4,158 | 1.1 | 3.6 | 354 | 0.3 | 1.3 | +3,804 | 2018 |
| Total population | 363,753 | 100.0 | 100.0 | 112,051 | 100.0 | 100.0 | +251,702 | |
Source: Australian Bureau of Statistics, Census of Population and Housing (opens a new window) 1991 and 2021. Compiled and presented by .id (opens a new window)(informed decisions).
(Enumerated data)
Compiled and presented in profile.id by .id (informed decisions).
Compiled and presented in profile.id by .id (informed decisions).
Dominant groups
Analysis of the five year age groups of the City of Casey in 2021 compared to Mornington Peninsula Shire shows that there was a higher proportion of people in the younger age groups (under 15) and a lower proportion of people in the older age groups (65+).
Overall, 22.8% of the population was aged between 0 and 15, and 10.7% were aged 65 years and over, compared with 16.6% and 26.3% respectively for Mornington Peninsula Shire.
The major differences between the age structure of the City of Casey and Mornington Peninsula Shire were:
- A larger percentage of persons aged 35 to 39 (8.7% compared to 5.2%)
- A larger percentage of persons aged 30 to 34 (8.1% compared to 4.7%)
- A smaller percentage of persons aged 70 to 74 (2.8% compared to 6.9%)
- A smaller percentage of persons aged 75 to 79 (1.9% compared to 5.5%)
Emerging groups
From 1991 to 2021, City of Casey's population increased by 251,702 people (224.6%). This represents an average annual population change of 4.0% per year over the period.
The largest changes in age structure in this area between 1991 and 2021 were in the age groups:
- 35 to 39 (+21,515 persons)
- 5 to 9 (+17,980 persons)
- 40 to 44 (+17,974 persons)
- 30 to 34 (+17,625 persons)