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Read the standard online, or download and print the PDF and tables from ‘Available files’ above. If you have problems viewing the files, see Opening files and PDFs.

Rationale

Age is a key variable for determining the demographic characteristics of a population. 

Classification of age/date of birth

Age is a flat classification with single-year categories from 0 years to 119 years inclusive, plus a category for 120 years and over. 

Classifications for date of birth are required because age is derived from the day, month and year a person is born. Date of birth is derived from three flat classifications: date of birth day, date of birth month and date of birth year. Day has single categories 01 to 31 (representing the days of the month). Month has single categories 01 to 12 (representing the months of the year). Year has single categories (representing 120 years back from the current year). For example, in 2007, the year classification range starts with 1887, which is 120 years from 2007. All three classifications also have residual categories which are defined in Glossary and references.

Age

Classification Age – New Zealand Standard Classification
Abbreviation AGE
Version V1.0
Effective date 26/01/1995

 

Date of birth – day

Classification Date of Birth – Day Classification  
Abbreviation BIRTHDAY
Version V1.0
Effective date 30/03/1999
 

Date of birth – month

Classification Date of Birth – Month Classification
Abbreviation BIRTHMON
Version V2.0
Effective date 30/03/1999
 

Date of birth – year

Classification Date of Birth – Year Classification
Abbreviation BIRTHYR
Version V21.0
Effective date 01/01/2016
 
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