Cockatiel flight-age

Question
A friend offers me a 2 cockatiels for sale, which he says are almost flying. He has an aviary, so he doesn't really know when the birds were born. Based on the "nearly flying" piece of information, is it possible to guess the age of the bird? Would the bird still be young enough to be tamed?

Answer
Hi, Gus,

Depending on developmental progress, a tiel that is just ready to fledge will be about 5-6 weeks old (less than 2 months of age).  Whether the bird(s) are young enough to be tamed depends on the individual bird.  However, you need to start NOW handling, interacting with the bird(s) on a daily basis.

Chrys