Skip to content Learn about the access keys available for Aristotle Open Metadata Registry

Person—age, total years N[NN] (Data Element)


The age of the person in (completed) years at a specific point in time.


Data Element (this item)


This representation is based on the value domain for this data element, more information is available at " Total years N[NN] ".
Data Type Number
Format N[NN]
Maximum character length 3
Permissible Values
Value Meaning Start Date End Date
Supplementary Values 999 Unknown/not stated - -


Guide for use:

Age in single years (if aged under one year, record as zero).

If age (or date of birth) is unknown or not stated, and cannot be estimated, use Code 999.

National community services and housing assistance data dictionary specific:

If year of birth is known (but date of birth is not) use the date, 0101YYYY of the birth year to estimate age (where YYYY is the year of birth).

National housing assistance data dictionary specific:

In the housing assistance data collections age is calculated at 30 June for the corresponding year.


Age is a core data element in a wide range of social, labour and demographic statistics. It is used in the analyses of service utilisation by age group and can be used as an assistance eligibility criterion.


Australian Bureau of Statistics, Standards for Social, Labour and Demographic Variables. Reference through:


National community services data dictionary specific:

Different rules for reporting data may apply when estimating the Date of birth of children aged under 2 years since the rapid growth and development of children within this age group means that a child's development can vary considerably over the course of a year. Thus, more specific reporting of estimated age is recommended.

Those who need to conduct data collections for children where age is collected in months, weeks, or days should do so in a manner that allows for aggregation of those results to this standard. 


This content Based on Australian Institute of Health and Welfare material. Attribution provided as required under the AIHW CC-BY licence.

Related content

Inclusion in Data Set Specifications

This data element is included in the following Dataset specifications, some datasets may be hidden based on your current permissions.

Use in indicators

This data element is included in the following Indicators, some indicators may be hidden based on your current permissions.

As a numerator

As a denominator

As a disaggregation