I grew up in deep country, with milk straight from the cow (we pasteurized it ourselves) and eggs 'straight from the chicken's butt', as I called it. I heard that the jumbo eggs and double yolks were more common in older chickens.
if you love yolks, then it's a win-win! Yummy yolks. But if you want to make meringues, then you've lost out on some eggwhites. LOL