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Between 2013 and 2028, the age structure forecasts for Porirua City indicate a 18.8% increase in females under working age, a 83.9% increase in females of retirement age, and a 24.4% increase in females 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 Porirua 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|
|Porirua City - Total females||2013||2028||2048||Change between 2013 and 2048|
|Age group (years)||Number||%||Number||%||Number||%||Number|
|0 to 4||2,271||8.2||2,580||7.2||3,143||6.9||+872|
|5 to 9||2,146||7.8||2,577||7.2||3,166||7.0||+1,020|
|10 to 14||2,025||7.3||2,493||7.0||3,078||6.8||+1,052|
|15 to 19||1,950||7.1||2,422||6.8||2,916||6.4||+965|
|20 to 24||1,825||6.6||2,048||5.7||2,468||5.4||+643|
|25 to 29||1,570||5.7||2,008||5.6||2,286||5.0||+715|
|30 to 34||1,725||6.2||2,261||6.3||2,548||5.6||+823|
|35 to 39||2,000||7.2||2,550||7.1||2,982||6.6||+982|
|40 to 44||2,235||8.1||2,642||7.4||3,276||7.2||+1,041|
|45 to 49||1,949||7.1||2,474||6.9||3,291||7.2||+1,341|
|50 to 54||1,985||7.2||2,291||6.4||3,097||6.8||+1,113|
|55 to 59||1,630||5.9||2,180||6.1||2,878||6.3||+1,247|
|60 to 64||1,420||5.1||1,882||5.3||2,578||5.7||+1,158|
|65 to 69||1,100||4.0||1,731||4.9||2,262||5.0||+1,162|
|70 to 74||785||2.8||1,392||3.9||1,994||4.4||+1,209|
|75 to 79||440||1.6||1,116||3.1||1,701||3.7||+1,261|
|80 to 84||335||1.2||657||1.8||1,108||2.4||+773|
|85 and over||210||0.8||381||1.1||673||1.5||+463|
In 2013, the dominant age structure for females in Porirua City was ages 0 to 4, which accounted for 8.2% of the total females.
The largest increase in females between 2013 and 2028 is forecast to be in ages 75 to 79, which is expected to increase by 676 and account for 3.1% of the total females.
The largest female 5 year age group in 2028 is 40 to 44 years, with a total of 2,642 females.
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