What breed are my chicks and how old??

[ColdWaterFarms]

I just bought these little guys and I have no clue how old they are and what breed

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[SternRose]

Can we get a picture of just one standing, or u holding?

 

[Cwestlake]

My 4 chicks are growing fast! I was told from the feed store 1-Amerucana, Olive Egger, Welsummer and not sure what the one is with White on her chest And the Bottom Pictures Are my Sweet 1 years old now White Leghorn, Speckled Sussex, RIR, Barred Plymouth Rock