approx 12 wks old. Backstory: I had what I thought were 3 Barred Rock hens and 1 RIR Rooster, well I hatched some eggs and ended up with three that look like this, and the red one that is in the background of the pic. Based on black sex link info i've found this SHOULD be a roo... But they also should have all hatched out barred or black, so I'm not sure what the original hens or roo have hidden in their genes. lol.