Protect your skin from the sun. Exposure to UV light speeds up the natural aging process of your skin, causing wrinkles and rough, blotchy skin. In fact, sun exposure is the No. 1 reason for signs of aging in the skin, including uneven pigmentation. Protect your skin — and prevent future wrinkles — by limiting the time you spend in the sun and always wearing protective clothing and a hat. Also, use sunscreen on exposed skin year-round when outdoors.