Project purpose: Mate Māori - Kōrero Kaumātua is a project within Te Puawaitanga o Ngā Tapuwai Kia Ora Tonu - Life and Living in Advanced Age: a Cohort Study in New Zealand (The LILAC Study NZ). The purpose of Mate Māori - Kōrero Kaumātua is to document the knowledge of Mate Māori held by the oldest old Māori (aged 80-90 years).