I am not sure, they did not post a age in the add. I think it looks a couple weeks older then my chicks who are 4 weeks old. I can tell from the picture there is enough of a size difference that I would not feel comfortable housing it with my chicks. The silkies are just too little right now. Thanks to the reference pictures you posted I am not as worried about Adele. Her pompom is nice and rounded, not wild and crazy. That said, she is only 4 weeks and I do not know if being a mix she will hold true to that.