Population and age structure
Between 2011 and 2026, the age structure forecasts for Willoughby City indicate a 11.2% increase in population under working age, a 47.8% increase in population of retirement age, and a 13.5% increase in population of working age.
Knowledge of how the age structure of the population is changing is essential for planning age-based facilities and services, such as child care, recreation and aged care.
The forecast age groups of Willoughby City is a function of the current age of the population (people aging each year, being born and dying) as well as the age of people migrating into and out of the area. This in turn is driven by location (fringe, city centre, regional or rural) the existing housing stock (separate dwellings, medium or high density), the amount and type of new residential development (same as existing stock, or diversifying) and where the area is in a cycle of change. We call this the area’s residential role and function. You can learn more about this in the section household and suburb life cycles.
|Forecast age structure - 5 year age groups|
|Willoughby City - Total persons||2011||2026||2036||Change between 2011 and 2036|
|Age group (years)||Number||%||Number||%||Number||%||Number|
|0 to 4||5,045||7.1||5,180||6.2||136||5,414||6.1||+370||136||234||7.3||0||21||2|
|5 to 9||4,375||6.2||4,943||5.9||568||5,146||5.8||+771||568||203||17.6||5||22||2|
|10 to 14||3,769||5.3||4,542||5.4||773||4,724||5.3||+955||773||182||25.4||10||23||2|
|15 to 19||3,694||5.2||5,170||6.2||1,477||5,187||5.8||+1,493||1,477||17||40.4||15||2||2|
|20 to 24||4,782||6.7||5,681||6.8||899||5,978||6.7||+1,196||899||297||25.0||20||3||2|
|25 to 29||5,620||7.9||6,206||7.4||586||6,689||7.5||+1,069||586||484||19.0||25||4||2|
|30 to 34||6,118||8.6||6,534||7.8||416||6,994||7.8||+876||416||460||14.3||30||5||2|
|35 to 39||6,095||8.6||6,583||7.9||488||6,925||7.8||+830||488||342||13.6||35||6||2|
|40 to 44||5,696||8.0||6,293||7.5||597||6,548||7.3||+852||597||254||14.9||40||7||2|
|45 to 49||5,068||7.1||5,753||6.9||685||6,035||6.8||+967||685||282||19.1||45||8||2|
|50 to 54||4,392||6.2||5,069||6.1||677||5,336||6.0||+944||677||267||21.5||50||9||2|
|55 to 59||3,886||5.5||4,404||5.3||518||4,660||5.2||+774||518||256||19.9||55||10||2|
|60 to 64||3,627||5.1||3,886||4.7||259||4,192||4.7||+565||259||306||15.6||60||11||2|
|65 to 69||2,511||3.5||3,431||4.1||920||3,743||4.2||+1,232||920||312||49.1||65||24||2|
|70 to 74||1,956||2.8||3,061||3.7||1,105||3,358||3.8||+1,402||1,105||297||71.6||70||25||2|
|75 to 79||1,579||2.2||2,710||3.2||1,132||2,984||3.3||+1,406||1,132||274||89.1||75||26||2|
|80 to 84||1,379||1.9||1,891||2.3||512||2,518||2.8||+1,138||512||627||82.5||80||27||2|
|85 and over||1,547||2.2||2,168||2.6||621||2,839||3.2||+1,293||621||672||83.6||85||19||2|
Population and household forecasts, 2011 to 2036, prepared by .id (opens a new window), the population experts, July 2015.
In 2011, the dominant age structure for persons in Willoughby City was ages 30 to 34 , which accounted for 8.6% of the total persons.
The largest increase in persons between 2011 and 2026 is forecast to be in ages 15 to 19 , which is expected to increase by 1,477 and account for 6.2% of the total persons.
The largest 5 year age group in 2026 is 35 to 39 years, with a total of 6,583 persons.