Nah, I had 9-10 week old roos trying to have their way with the females that were about 16 weeks.. Only question is how many boys per girl? 4 months old is almost point of lay and the roo probably knows that.

My older roos don't even bother if the combs aren't pink.
I have a 4 month old roo that doesn't even LOOK at the ladies yet /sigh. And he's so pretty too - his ladies are laying gorgeous blue infertile eggs.
Oh and peeps... Just found out in time for my birthday (monday) - I got the job! woo hoo!