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I think you're right. Seems like we've had them coming up on16 weeks. Not 100% on their age at purchase. The rooster has started going after them in the last week or two. Must be pheromones.

When did you get them? I mean, were they little babies? Usually they sell them at just a few days old. :) my chickens started showing signs of lay at around 16 weeks. Look up "the chicken squat" and the "egg song". I'm still confused at this egg song business cause mine sing it and they've not laid yet that day, they just like to get me excited, I guess! Lol