BCM and BO that are 35 weeks old and have not laid yet! Help?!

[NoleJoe]

I looked around the forums and didn't see anything on this so here goes:
I have some Black Copper Marans and some Buff Orpingtons that I got the first week of February this year and they have not started laying yet. I have raised RIRs, EEs, Silkies, and White Leghorns before and they all laid around 18 - 20 weeks at most. What is going on? They are all large and healthy looking and have plenty of food and water daily.

 

[Choco Maran]

do not know what to say except maybe they are late layer. Could be the weather also keeping them from starting.

 

[NoleJoe]

It has been a hot summer here in Florida but it has cooled down nicely over the last few weeks. Hopefully, they will start soon. I am getting worried about diseases or mites, etc. Never had that problem before though.

 

[Den in Penn]

Can they have a nest somewhere other then the nest box?