My girls are 16 1/2 weeks old. I have heard to wait till they are 4 mnths old to worm (not sure if that is true) but anyhow. I was wondering if worming now, before they are laying would be best. That way i wont have to throw away eggs later on! Note-- i am not having a worm problem, this is precautionary. And I will be using ivermectin.