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Porirua CityCommunity profile

Porirua City

Service age groups

Porirua City had a higher proportion of pre-schoolers and a lower proportion of people at post retirement age than Titahi Bay North in 2018.

The Age Structure of the population is the most widely used component of the Census. It is an indicator of an area’s residential role and function and how it is likely to change in the future. Porirua City's age demographics are indicative of the area’s era of settlement and provide key insights into the level of demand for services and facilities (as most services and facilities are age-specific).

Service age groups divide the population into age categories that reflect typical life-stages. They indicate the level of demand for services that target people at different stages in life and how that demand is changing.

To get a more complete picture of Porirua City's demographic characteristics, Porirua City's Age Structure should be viewed in conjunction with Family and Household type data.


Derived from the Census question:

'When were you born?'

Age structure - Service age groups
Porirua City - Total persons20182013Change
Service age group (years)Number%Titahi Bay North %Number%Titahi Bay North %2013 to 2018
Babies and Pre-schoolers (0 to 4)4,4047.87.34,4318.69.4-27
Primary Schoolers (5 to 11)6,57311.611.35,77511.210.8+798
Secondary Schoolers (12 to 17)4,8788.67.94,8339.36.8+45
Tertiary education and independence (18 to 24)4,9508.87.44,7769.29.5+174
Young workforce (25 to 34)7,37113.016.45,89811.413.7+1,473
Parents and homebuilders (35 to 49)11,75720.820.811,44822.121.3+309
Older workers and pre-retirees (50 to 59)7,17912.711.66,57912.713.0+600
Empty nesters and retirees (60 to 69)5,2659.310.34,6989.19.0+567
Seniors (70 to 84)3,6246.46.02,8505.55.5+774
Elderly aged (85 and over)5581.00.94320.81.0+126
Total population56,559100.0100.051,720100.0100.0+4,839
Source: Statistics New Zealand, Census of Population and Dwellings 2013 and 2018. Compiled and presented in by .id , the population experts.
Stats NZ data quality rating: Very high
Please refer to specific data notes for more information

Dominant groups

Analysis of the service age groups of Porirua City in 2018 compared to Titahi Bay North shows that there was a higher proportion of people in the younger age groups (0 to 17 years) and a lower proportion of people in the older age groups (60+ years).

Overall, 28.0% of the population was aged between 0 and 17, and 16.7% were aged 60 years and over, compared with 26.5% and 17.2% respectively for Titahi Bay North.

The major differences between the age structure of Porirua City and Titahi Bay North were:

  • A larger percentage of 'Tertiary education and independence (18 to 24)' (8.8% compared to 7.4%)
  • A larger percentage of 'Older workers and pre-retirees (50 to 59)' (12.7% compared to 11.6%)
  • A smaller percentage of 'Young workforce (25 to 34)' (13.0% compared to 16.4%)
  • A smaller percentage of 'Empty nesters and retirees (60 to 69)' (9.3% compared to 10.3%)

Emerging groups

From 2013 to 2018, Porirua City's population increased by 4,839 people (9.4%). This represents an average annual population change of 1.8% per year over the period.

The largest changes in the age structure in this area between 2013 and 2018 were in the age groups:

  • Young workforce (25 to 34) (+1,473 persons)
  • Primary Schoolers (5 to 11) (+798 persons)
  • Seniors (70 to 84) (+774 persons)
  • Older workers and pre-retirees (50 to 59) (+600 persons)

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