Estimated median age of Māori people in New Zealand

All population estimates at 30 June 2018 and beyond use the 2018-base ERP.

Māori ethnic population is the population who identify themselves with the Māori ethnicity with or without other ethnicities.
Because ethnicity is self-perceived, people can identify with Māori ethnicity even though they are not descended from a Māori ancestor. Conversely, people may choose to not identify with Māori ethnicity even though they are descended from a Māori ancestor. It is a measure of cultural affiliation (in contrast to race, ancestry, nationality, or citizenship).

Māori population estimates are obtained by updating the base population of the Māori ethnic group for births, deaths, estimated net migration, and estimated inter-ethnic mobility during the ensuing period.

The estimated resident population of the Māori ethnic group is based on the census usually resident population count of the Māori ethnic group with adjustments for Māori residents missed or counted more than once by the census (net census undercount), for Māori residents temporarily overseas on census night and for non-response to the census ethnicity question.

The estimates refer to the mean value for the specified calendar year.

http://datainfoplus.stats.govt.nz/Item/nz.govt.stats/5b6313fc-3ce3-434e-8ee7-6bac79305e53?_ga=2.100668225.1774620703.1653059416-438339483.1627939401
https://www.stats.govt.nz/information-releases/maori-population-estimates-mean-year-ended-31-december-2022

The accuracy of the estimates depends on the accuracy of the estimated base and change in numbers. The accuracy of the base depends on the accuracy of the census and the estimated adjustments made to the base.

At URL provided, select 'Population > Population Estimates - DPE > Maori Ethnic Group Estimated Resident Population by Age and Sex (1991+) (Annual-Dec)'. All variables were selected to create this dataset.