My Wyandotte chicks

I don't know the date they were hatched, but I bought 3 on June 26th from a breeder (sex unknown) & from the feed store I bought 2 silver laced black pullets (thats what they were labled anyway).

I think 2 of the blue laced red wyandottes are roosters cause the 3rd one looks different--smaller, no comb. What is the age of most chicks that are sold at the feed stores???