How many years did the oldest cockatoo in captivity live?

Cookie (June 30, 1933 – August 27, 2016) was a male Major Mitchell's cockatoo residing at Brookfield Zoo, near Chicago, Illinois, United States. He was believed to be the oldest member of his species alive in captivity, at the age of 82 in June 2015, having significantly exceeded the average lifespan for his kind. He was one of the longest-lived birds on record and was recognised by the Guinness World Records as the oldest living parrot in the world.

The next-oldest Major Mitchell's cockatoo to be found in a zoological setting was a 31-year-old female bird located at Paradise Wildlife Sanctuary, England. Information published by the World Parrot Trust states longevity for Cookie's species in captivity is on average 40–60 years.