Mine are 12 weeks (RIR/Leghorns). The RIR's are starting to get a bit red in the comb but the leghorns, nada. I think I'll be waiting a while. At least I'm pretty sure they are pullets. We are installing the nest box in a week or two - it's an extra 5SF in a slightly crowded coop so that's a help. Everytime I go out I say 'good morning, ladies! where's my eggs?'.. Yes, I am impatient. LOL.