To the OP's question, you can butcher at 4 weeks and that would be one of those "cornish game hens" you buy at the store. So no age is too young. There are some who eat chicks before they hatch in the form of balut.
This also means that organic labeling can be cast with the same type of doubt.
lol.. just because they aren't "allowed" to do something doesn't mean they follow the rules.. check this out :
http://www.sciencedaily.com/releases/2012/04/120405131431.htm
not hormones.. but still.. they found banned drugs in feather meal... nice huh?
This also means that organic labeling can be cast with the same type of doubt.