I got these ladies as a RIR and black aussie (which....no.) They were feathered when we got them May 1 and May 9 (Alice was a replacement from the same breeder for a chicken that died two days aftrr we got her). He had no idea how old they were-just that they were between 4-8 weeks old (helpful.) By that math, i estimate they are 16 weeks old roughly. What do yall think?