I am not sure on the age, but their voices are just changing from the 'peep peep' noise to the big chicken noise. Here is the comb:
And here is the other little one I bought at the same time:
I am reasonably certain the little orange one is a pullet?
I bought 2 silkies yesterday, I told the seller to double check that they were both definitely HENS as we are not allowed to have roosters and he promised they were.. but now looking at one of them I an suspicious... can someone please take a look at this little one and give me their opinion as...