Galah cockatoos have a pretty impressive lifespan that appears to generally be with the higher array when it comes to parrot lifespans. While in the wild it seems they live to all around 20, but minimum 40 yrs just isn't unheard of in the least for this species in captivity. https://danteeznfq.creacionblog.com/35994554/indicators-on-sulphur-crested-cockatoo-habitat-you-should-know