So I got my 7 chicks exactly 4 weeks ago from 2 different feed stores. But obviously they weren't born the day I bought them so how old are they? Would you just say 4 weeks? Or would you add a week and call them 5? I'm thinking, that at least with the Cochin, she was at least a week old when I got her. But a few of the others had just come in that morning. How old are they when they ship them to the stores.