List of prime ministers of New Zealand by age

This is a list of prime ministers of New Zealand by age, including when they were born, what age they were when they were appointed prime minister, what age they were when they left the office and the age at which they died, or their current age as of 12 August 2024 if they are still alive. The table can be sorted by each different category.

The date of appointment is the date on which they were sworn in by the governor-general for their first term. The day on which they departed office is the final day of their final term. This is either the day a new prime minister was appointed or their date of death if they died whilst in office.