I have 2 hens and a silkie rooster that are 18 weeks old and 2 hens that are 14 weeks old. Can I feed layer feed to them, because I have no way to separate the ages? Would it be better to wait until the little ones are 18 weeks old? If it makes a difference, they haven't laid an egg, yet, but are showing signs like red wattles and the squatting behavior.