Either the previous owner lied about them laying or you are mistaken about their age. I've seen someone here on CL selling the same "7 month old" since February!Hey all. How long after bringing in hens until they start laying. We added 8 Buff Orpingtons to our flock and the previous owner said they were all laying. They've been here about three days an not one has laid a single egg. Do they normally need some time to adjust? How long before we should be concerned?
Not even white leghorns lay that young! Orpington to the best of my knowledge are on the slower side to mature.They are about 2 - 3 months old.
At least now you have a little info. Thing is if they are that young they should still be eating a grower feed. To much calcium can cause kidney problems.
Also if they are at laying age they should have red combs and squat when you reach down on top to pet them.
Hope this helps you find out what you really have going on! Might be worth contacting the person you got hem from and see if you can get the truth.
Good luck!