Gosh I would say your silkies look more like 2 to 3 months old.. I have photos of mine a 2 months and they look about like yours in the photos (with the sheath(not sure if that is what that is called) still around the feathers at the comb area, etc). Mine just turned 4 months old on the 6th and my Blue Roo just started crowing this morning but both my white and Patridge Roos have been Crowing for about a month. The Blue Roo has hardly any comb or waddles and up until this am I was undecided.