I am having a similar debate about a 13 week old orloff that does not have saddle feathers of a curved tail.... yet. I got two Russian Orloffs, purchased as hens, this weekend, born August 11 I was told, from a very reputable farm that made a delivery to my area this weekend as they are 4.5 hours drive away. When I got home, I noticed the two chickens were completely different sizes/maturity. I asked their age and was told, both born August 11. They are beautiful friendly birds and I love them already but just hoping they are both hens as I can't have roosters where I live. I'll attach photos of both but will most likely have to wait until the bigger one gets a little older to see if the feathers go roo or hen. I will also contact the farm to confirm they are the same age.