The main cause of forehead lines is a decrease in the production of collagen and elastin in the skin. These proteins are responsible for our skin’s elasticity, but production drops as we age. Good preventative action includes minimising stress, using an SPF to protect your skin from harmful UV rays all year round, avoiding smoking, drinking plenty of water and following a good skincare routine, especially ensuring the use of a good moisturiser.
You may begin to notice the first signs of forehead lines in your late twenties and early thirties as faint lines begin to appear. With time, these lines gradually deepen and become increasingly prominent until they are visible even when you aren’t raising your eyebrows or frowning. Although age makes them worse, some people have forehead lines before they have any other signs of ageing skin.