Little documented evidence of the actual life-span of psittacines has been reported in the literature. Macaws have been documented to live into their late forties, one was 52 years, another was 57. In the collection that I maintain, I have a Blue and Gold macaw hen that is a documented 51 years of age, at this time. Even more surprising, she laid a fertile egg this season that hatched. I have a cockatiel patient that is 27 years old, and still going strong.
Amazons can be very long-lived.
I have another Double yellow-headed Amazon patient, Rocky, that is over 36 years old. The owners still have the bill of sale, and Rocky was purchased with adult head coloration, in 1962. Of course, with leg banding and accurate breeder records, it is possible to often know the exact age of a domestically hatched pet bird. Many aviculturists will use closed leg bands stamped with identification letters and a two digit number, indicating the year of hatch. But, be aware that, on occasion, a band from an earlier year may be used, which may confuse an owner, who may think that a bird is actually older than it is.