If my calulations are correct I bought my 5 Orpingtons on March 18 so on July 18 they will be exactly 18 weeks old. Im crossing my fingers hoping the laying will begin ! THEN the next week my 4 RIR hens will be 18 weeks old as well. I hope the eggs come in droves. One question - Is it okay that Im feeding them layer feed now or am I suppose to wait until the 18th week ?