How true Kathy.
I have noticed that the ones that change older are your darker ones. We always check their shoulder undercoat by the forearms to see if they were breaking then correctly - at 4-6 months of age.
My hubby says its like a really good drink - mixing one smitchen too far in either directions and it is not as good. I guess that is why really good bar tenders get paid well. LOL And you can say that too for really good cooks - chefs. LOL
T.