1. Beta-carotene that is not converted into vit A serves a protective barrier against disease. 3. VITAMIN A DEFICIENCY Vitamin A utilized in the body is dependent on 1. Quantity stored in liver a. Deficiency symptoms appear in 1-2 years due to high amounts stored in liver 2.
Wild Lifespan. In their natural wild habitats, cockatiels, on average, live between 10 and 14 years, indicates Animal Diversity Web via the University of Michigan. Their average age for passing away is younger in the wild than it is in captivity. Captive Lifespan Cockatiels that are kept as pets -- or that live in other captive settings -- can stay alive for up to 25 years or so.
Report Abuse. Generally they can live to about 25 years if they are on a healthy diet and don't have any health issues. I do know of one lady who has a 29 year old Cockatiel, that may be a record though. Sapphyre Certified Avian Specialist http://www.borrowed-rainbow.com http://groups.yahoo.com/group/BorrowedRa...he great thing about cockatiels is that they can live longer than dogs and cats, but they don't live (almost) forever like the larger parrots like amazons and macaws! Source(s): Cockatiel breeder and long time bird owner. white_ravens_white_crows Â· 9 years ago.