Thanks so much for your comments.
I read conflicting information about the male shedding his older feathers once a year and then regrowing them. Either way, if I cannot get my hands on quality feathers that are at least 5 years of age or older - from what I've read these are the preferred feathers - then it matters not. I will indeed take a look at the Polish Quills you mentioned.
I came across this article while searching for good peacock feathers. The feathers in the article look superior.
Thanks again for your help.