Had to go back to retrace exact date I purchased them: Oct 5. The Dominique, Wyandotte and Austalorp were all the same age, at most 1 week old. The feed store gets their shipments in on Thursdays, so a good assumption they would be possibly 3-5 days old if the feed-store gets them upon hatching. That's only an assumption mind you because I truly do not know at what stage/age they get their livestock. The RIR was in a separate brooder which the guy said was 1 week older. So then, the three are 2 1/2 weeks old and the RIR is 3 1/2 weeks old give or take a day.
As far as male/female, the feed store had them all separated male/female which they guarantee a 95% accuracy rating on. I purchased from the female side of course, so not straight run. I admit I am new to owning chickens, and so cannot tell as of yet if any are in fact male. I hope not, ha not be sexist, but I hope not.