They look just like my Hope, who is 23 weeks old and (hopefully) getting ready to start laying.
Up to what age do you reliably get eggs from yours? I saw that your 7-year-old only occasionally lays, but what about the others? I keep reading that chickens only lay for two seasons...
bawkbawk, I have found that if you don't force them to lay through winter (with lights) they can lay for a pretty long time, although they tend to get less consistent around 5 years.