Premature aging appears when the skin starts showing early signs such as wrinkles, fine lines, dark spots, dryness, uneven tone, and sagging. Hair may also turn gray or thin before time. The main reasons include too much sun exposure, smoking, alcohol use, poor diet, lack of sleep, stress, dehydration, and pollution. These factors damage collagen and reduce skin firmness, making the skin look older than it should. Protecting your skin from the sun, eating healthy, staying hydrated, and getting enough rest can help prevent premature aging.