My two BR are 8 months old. Dot, in the back, has never once laid an egg (she's been cooped up, she's not eating or hiding eggs, etc.) Her comb is dry, pale red, and her vent is consistent with a non-laying hen, as described on other forums. She is roughly the same size and weight as the other BR.
Pepper, the hen in front, consistently laid 5-6 eggs a week once she got going and then production just up and ceased completely about 3 weeks ago, in early October.
Both hens free range and forage during the day and have access to layer feed and oyster shells. No one appears to be molting (or even old enough to!) They all sleep securely within a locked coop at night.
Any ideas or encouragement? The ladies are great pets but I'd love to get more than 1 egg/day!