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Porirua CityCommunity profile

Porirua City

Five year age groups

There were 555 people over the age of 85 living in Porirua City in 2018, with largest age group being 5 to 9 year olds.

The Age Structure of Porirua City provides key insights into the level of demand for age based services and facilities such as child care. It is also an indicator of Porirua City'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 Porirua City's Age Structure should be viewed in conjunction with Households and Dwelling Type.


Derived from the Census question:

'When were you born?'

Note: This page includes data from the 2018 Census. Between 2013 and 2018, the geographical classification was changed, and with it many boundaries were altered. As a result, you may see different small area options when comparing to pages that do not yet show 2018 data. Learn more.

Age structure - Five year age groups
Porirua City20182013Change
Five year age groups (years)Number%Wellington Region %Number%Wellington Region %2013 to 2018
0 to 44,4047.85.94,4318.66.7-27
5 to 94,7408.46.54,2098.16.5+531
10 to 144,2997.66.24,0357.86.4+264
15 to 193,8766.96.63,8317.47.0+45
20 to 243,4866.27.43,3096.47.5+177
25 to 293,7626.77.62,7575.36.5+1,005
30 to 343,6096.46.93,1446.16.6+465
35 to 393,7866.76.73,6637.16.8+123
40 to 443,8796.96.64,0117.87.6-132
45 to 494,0897.27.13,7747.37.3+315
50 to 543,7326.66.73,5346.87.0+198
55 to 593,4506.16.43,0455.95.8+405
60 to 642,8745.15.22,6495.15.2+225
65 to 692,3914.24.52,0524.04.3+339
70 to 741,8033.23.71,4492.83.2+354
75 to 791,1972.12.78281.62.3+369
80 to 846271.11.75701.11.8+57
85 and over5551.01.74320.81.6+123
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 five year age groups of Porirua City in 2018 compared to Wellington Region 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, 23.8% of the population was aged between 0 and 14, and 11.6% were aged 65 years and over, compared with 18.5% and 14.3% respectively for Wellington Region.

The major differences between the age structure of Porirua City and Wellington Region were:

  • A larger percentage of persons aged 5 to 9 (8.4% compared to 6.5%)
  • A larger percentage of persons aged 0 to 4 (7.8% compared to 5.9%)
  • A larger percentage of persons aged 10 to 14 (7.6% compared to 6.2%)
  • A smaller percentage of persons aged 20 to 24 (6.2% compared to 7.4%)

Emerging groups

From 2013 to 2018, Porirua City's population increased by 4,836 people (9.3%). This represents an average annual population change of 1.8% per year over the period.

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

  • 25 to 29 (+1,005 persons)
  • 5 to 9 (+531 persons)
  • 30 to 34 (+465 persons)
  • 55 to 59 (+405 persons)

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