I've been incubating eggs for a long time, but never keep the chicks, now in a new marriage, i have a 5yr old step daughter that has fell in love with my old hens(have 6 and the youngest is 4yrs old ) long story short,she talked me into hatching her a litter of chicks,how old do they need to be, before i put them in with the old granny hens? 
