Knowing the age of our Austrolorps

[steveg144]

So we have "Camilla" (our Leghorn) and "Nigella" (our Austrolorps). Those identifications are based on wading through boatloads of googled "chicken pictures".

So Camilla pops out an egg a day, no matter what (we call her "Old Faithful"...). Nigella, not a single egg yet. I know all the reasons why she wouldn't lay in winter, but was wondering if there's any way to tell, without slicing them down the middle and counting the rings

, how old she is? Interesting thing I just noticed: the places on her face where her "temples" and "eyebrows" would be if she were human have a sheen of grey hair (ok, feathers, but you know what I mean). Is a "touch of grey" a normal part of Austrolorps coloration? Or do hens "go grey" when they get older? Thanks as always, gang!