New Ameraucana chicks..age?

[Jennyfromtheblok]

I don’t have a good pic yet except for this one when I brought them out into our barn today but can anyone give me an idea of how old these chicks are? I picked them up at a local farm store today. They were in with younger chicks (probably less than a week old). I’m thinking since they are partially feathered about 2.5-3 weeks old maybe? What do you think? Ive never had baby chicks before, only ducklings. I’m also curious as to what the white ones will look like when they’re older.

 

[Dottie the Chicken]

Probably around 3 weeks old.

 

[rosemarythyme]

Between 3-4 weeks, I'm thinking.