If I needed the meat it would be different but right now I'm good ... I still have 12 or so jars of chicken in the cellar. Plus the game hen was given to my son by a friend that has passed over, I will miss her when she follows. (What can I say...)Oy vey, I just give my gals 72 weeks max., regardless. If production stops sooner, they just make it into the stewing pot/canning jars quicker is all. After reading some of these posts, perhaps I should reconsider/revisit the 72 week rule.
If I understand your post correctly, you're asking when a hen will stop "hatching" a clutch of eggs?!?! The answer to that depends on the hen and the breed (even the strain of the breed can vary)....I've had 5-6 year old Buckeye hens that would go "broody" (want to sit on eggs) but I've had 2 year old hens start sitting and mid-stream abandon the clutch of eggs.My hen is around 4 years old and she will not finish sitting on her eggs, so I have stopped letting her sit. I always incubate her eggs now. At what age are they too old?