I wanted to start with a small amount of chickens, so I just went to an auction barn and bought these. They were all sold together as an assortment (one died next day ), but they couldn't tell me the type or age or anything, cause the person who sold them didn't give them this info. Please help a newbie see what they are, will be and approx age. I was thinking about 10-12 weeks on the smaller ones, the larger black one looks to be for sure older, but I don't know. Thanks so much.