the expert speaks glad to know I was close...Looks like she's lost the barring on her head, so at least 3 to 4 months old. If her irises are very pale, then she would be at least eight months old. If they aren't very pale, then she would be somewhere between four and eight months old.
Okay, off to attempt to clean out my coop! The entire thing hinges on whether or not the wheelbarrow has unfrozen from the ground, so wish me luck!