Facial lines, creases and wrinkles often develop in our 30s and become more prominent in our 40s. Common concerns are the development of forehead lines, frown lines, crow’s feet, bunny lines, nasolabial folds as well as other fine lines and wrinkles. They are caused by the gradual loss of collagen, elastin and skin hydrators; repetitive facial expressions; gravity and mechanical compression. Crow’s feet wrinkles describe the fine lines that branch out from the outer corners of your eyes toward your temples and are most visible when you smile.