I just received a Marans rooster and hen to add to my flock within the last week. She said he hadn't crowed yet. He crowed two days after I got him and this morning I saw him mount a hen. I thought he was too young for this. I think she said he and the hen are just around 12 weeks old. I can't remember for certain so I emailed her to confirm the age. If he is old enough to crow and mount the hens does that mean the hen that came with him is old enough to start laying eggs soon or is he just practicing? She said they were hatched out at the same time. I haven't seen any eggs from the hen yet though.