Okay everyone first let me say that I am NOT planning on doing what I am about to ask anytime soon!!!!!!!!!! I am only asking for future references and maybe someone else might be interested in knowing the answer to this too: Okay I have some chicks that are 3 weeks old and then some that I got this week from a hatchery. I was told by the people that I got my 3 week old chicks from that it would fine to let them be together after the 2 different ages was fully feathered out. I want to know what do you think based on your own personal experience. I don't have any adult chickens only these. I have a huge enough chicken house that it is no problem keeping them seperated for however long it takes. I just don't want to introduce them together too soon.