I have a mixed flock of productio reds 10 hens 1 roo and 4 "big white tanks" hens. These range in age from about 18 months to 2 1/2yrs the whites and 4 reds are oldest. I also have 5 black sexlink that are 12 wks. I have been getting steady 8-14 eggs a day since early march. Today I got 17 eggs. My question, Which is more likely older hens laying xtra eggs or young hens laying?