They might start laying again when the little ones do. I have a four year old chicken that hardly lays , a four year old that lays 2-3 x week but the 2 and 3 year olds lay pretty consistent. Don’t give up. Maybe they have a secret nest somewhere??
No secret nest and I have a woman coming tomorrow to take the older girls. I can only have 6 chickens where I live and I refuse to feed farm animals that won't feed me. This lady will give them a good home.