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LEARN MORE ABOUT .idIn 2021, the largest age group in Seaforth was 10 to 14 year olds. The group that changed the most since 2011 was 55 to 59 year olds, increasing by 191 people.
The Age Structure of Seaforth provides key insights into the level of demand for age based services and facilities such as child care. It is also an indicator of Seaforth'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 Seaforth's Age Structure should be viewed in conjunction with Household Types and Dwelling Types.
Q:
Derived from the Census question:
'What is the person's date of birth or age?'
| Age structure - Five year age groups | |||||||
|---|---|---|---|---|---|---|---|
| Seaforth - Total persons (Enumerated) | 2021 | 2011 | Change | ||||
| Five year age groups (years) | Number | % | Northern Beaches Council area % | Number | % | Northern Beaches Council area % | 2011 to 2021 |
| 0 to 4 | 433 | 6.0 | 5.4 | 525 | 8.0 | 7.2 | -92 |
| 5 to 9 | 534 | 7.4 | 6.2 | 649 | 9.9 | 6.8 | -115 |
| 10 to 14 | 718 | 9.9 | 7.0 | 551 | 8.4 | 6.1 | +167 |
| 15 to 19 | 577 | 7.9 | 6.2 | 453 | 6.9 | 5.6 | +124 |
| 20 to 24 | 365 | 5.0 | 5.2 | 319 | 4.9 | 5.1 | +46 |
| 25 to 29 | 211 | 2.9 | 5.1 | 156 | 2.4 | 5.7 | +55 |
| 30 to 34 | 221 | 3.0 | 5.9 | 212 | 3.2 | 6.8 | +9 |
| 35 to 39 | 360 | 5.0 | 6.5 | 510 | 7.8 | 8.2 | -150 |
| 40 to 44 | 534 | 7.4 | 7.0 | 585 | 9.0 | 8.0 | -51 |
| 45 to 49 | 681 | 9.4 | 7.8 | 578 | 8.8 | 7.7 | +103 |
| 50 to 54 | 624 | 8.6 | 7.4 | 510 | 7.8 | 6.6 | +114 |
| 55 to 59 | 538 | 7.4 | 6.6 | 347 | 5.3 | 5.7 | +191 |
| 60 to 64 | 359 | 4.9 | 5.6 | 329 | 5.0 | 5.3 | +30 |
| 65 to 69 | 292 | 4.0 | 4.7 | 234 | 3.6 | 4.4 | +58 |
| 70 to 74 | 282 | 3.9 | 4.4 | 203 | 3.1 | 3.4 | +79 |
| 75 to 79 | 220 | 3.0 | 3.7 | 102 | 1.6 | 2.6 | +118 |
| 80 to 84 | 155 | 2.1 | 2.6 | 136 | 2.1 | 2.3 | +19 |
| 85 and over | 155 | 2.1 | 2.8 | 134 | 2.1 | 2.6 | +21 |
| Total population | 7,259 | 100.0 | 100.0 | 6,533 | 100.0 | 100.0 | +726 |
Dominant groups
Analysis of the five year age groups of Seaforth in 2021 compared to Northern Beaches Council area 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, 23.2% of the population was aged between 0 and 15, and 15.2% were aged 65 years and over, compared with 18.5% and 18.1% respectively for Northern Beaches Council area.
The major differences between the age structure of Seaforth and Northern Beaches Council area were:
- A larger percentage of persons aged 10 to 14 (9.9% compared to 7.0%)
- A larger percentage of persons aged 15 to 19 (7.9% compared to 6.2%)
- A smaller percentage of persons aged 30 to 34 (3.0% compared to 5.9%)
- A smaller percentage of persons aged 25 to 29 (2.9% compared to 5.1%)
Emerging groups
From 2011 to 2021, Seaforth's population increased by 726 people (11.1%). This represents an average annual population change of 1.06% per year over the period.
The largest changes in age structure in this area between 2011 and 2021 were in the age groups:
- 55 to 59 (+191 persons)
- 10 to 14 (+167 persons)
- 35 to 39 (-150 persons)
- 15 to 19 (+124 persons)
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