From what I can see of the pics, looks like you have at least 3 males. Unfortunately, those purchased from a feed store may not be as likely to lay nice, dark eggs as those you'll get from a breeder; but, I wish you the very best of luck. They appear to be about 8 weeks, as I don't see any chick fuzz left (typically by 7-8 weeks, most of the chick fuzz is gone).
Please be careful to acclimate them slowly to the outdoor temps if you are in a cold area.
If you've not had them before, I'm quite certain you'll truly enjoy them! They are beautiful birds, and personally are among my favorites. Mine are super laid back, and inquisitive...good foragers, and goodness, you sure can't beat the beautiful eggs! BEST of luck with them - keep us posted on your new birds!