Woman's Institute of Domestic Arts and Sciences, Woman's Institute Library of Cookery…
“ In a young chicken, it will be smooth and unmarred; in an old one, it will be rough and probably darker in color. If the feet have been left on, they too will serve to indicate the age. The feet of a young chicken are smooth and soft; whereas, those of an old bird are rough, hard, and scaly. The claws of a young one are short and sharp; but as the bird grows older they grow stronger and become blunt and marred with use. The spur, which is a projection just above the foot on the back of each leg, is small in the young chicken, and increases in size as the age increases. ”
