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City of OnkaparingaCommunity profile

2016 Census data has been released and we are busy processing it to update this website. View our latest releases here.


Five year age groups

This topic has been updated with 2016 Census data for all areas. What's this?

There were 197 people over the age of 85 living in Seaford in 2016, with largest age group being 30 to 34 year olds.

The Age Structure of Seaford provides key insights into the level of demand for age based services and facilities such as child care. It is also an indicator of Seaford'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 Seaford'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?'

Age structure - Five year age groups
Seaford - Total persons (Usual residence)20162011Change
Five year age groups (years)Number%City of Onkaparinga %Number%City of Onkaparinga %2011 to 2016
0 to 42665.96.22826.86.6-16
5 to 92696.06.42365.76.3+33
10 to 142686.06.12235.46.7+45
15 to 192064.66.22225.36.8-15
20 to 242405.46.02135.16.2+27
25 to 292525.65.92876.96.4-36
30 to 343387.56.52666.46.2+71
35 to 392575.76.32546.16.6+4
40 to 442816.36.62726.57.1+10
45 to 492605.86.92305.57.1+30
50 to 542405.46.72465.97.0-6
55 to 592796.26.62726.56.6+7
60 to 642906.56.32616.36.5+29
65 to 692736.16.12044.94.6+69
70 to 742275.14.31894.53.2+38
75 to 791733.92.81764.22.4-3
80 to 841593.62.01704.12.0-11
85 and over1974.42.11563.71.8+42
Total population4,486100.0100.04,167100.0100.0+319
Source: Australian Bureau of Statistics, Census of Population and Housing 2011 and 2016. Compiled and presented by .id , the population experts.

Please refer to specific data notes for more information

Dominant groups

Analysis of the five year age groups of Seaford in 2016 compared to City of Onkaparinga shows that there was a lower proportion of people in the younger age groups (under 15) and a higher proportion of people in the older age groups (65+).

Overall, 17.9% of the population was aged between 0 and 15, and 23.0% were aged 65 years and over, compared with 18.7% and 17.3% respectively for City of Onkaparinga.

The major differences between the age structure of Seaford and City of Onkaparinga were:

  • A larger percentage of persons aged 85 and over (4.4% compared to 2.1%)
  • A larger percentage of persons aged 80 to 84 (3.6% compared to 2.0%)
  • A smaller percentage of persons aged 15 to 19 (4.6% compared to 6.2%)
  • A smaller percentage of persons aged 50 to 54 (5.4% compared to 6.7%)

Emerging groups

From 2011 to 2016, Seaford's population increased by 319 people (7.7%). This represents an average annual population change of 1.49% per year over the period.

The largest changes in age structure in this area between 2011 and 2016 were in the age groups:

  • 30 to 34 (+71 persons)
  • 65 to 69 (+69 persons)