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Factors behind wrinkles and prevention All of us want to look younger than our true age. Lines and wrinkles on the forehead are a sign of ageing. As we age, our skin isn’t as elastic when we were young. Having less elasticity causes lines and wrinkles in old age. As we age, older cells of your skin also die and regenerate. The process slows down with age, and good lines and lines and wrinkles begin to appear. The movement of facial muscles causes wrinkles on the forehead also. Wrinkles are also due to exposure to the sun and dehydration. There are two layers in your skin, epidermis and dermis. Insufficient moisture causes great lines in skin’s surface area.