Grandma has more and more wrinkles at the corners of her eyes.
Tips
usage
褶子 is the everyday word for 'wrinkle' on fabric, paper, or skin. For specifically facial wrinkles in a more formal/cosmetic context, 皱纹 (zhòuwén) is preferred. Note 褶 in clothing terms (百褶裙 'pleated skirt') refers to intentional decorative pleats.