hi guys! i have never had a roo before.....but i have 2 very dear pet hens who are 4 years old. i love them so very much that i want to hatch out and keep a pullet from each of them. i have a question or 2......how old does a roo have to be before he can fertilize their eggs? and how long does he have to be with the hens before i can start collecting their eggs for incubation? also, are my girls too old to have babies? thanks for any replies/help!