Timeline for a rose comb

[Rocky Top Chick]

Does anyone know if a rosecomb develops slower than a pea or single comb. I have three rosecomb chickens 10 weeks old and nothing is even visible, just a smooth space. I am wishing for pullets and that's the reason, but since I got them from TSC in the straight run tub, I don't feel that lucky!

 

[LadyShred]

Rosecombs "rise" a lot slower than single combs, but more progessively than pea combs. There is a possibility that they are all females, because my golden sebright hen has just now grown a comb and she's nearly a year old.