The answer will make you frown (another expression that creates age lines)
When we make facial expressions such as smiling, scowling, or talking, grooves form on our skin perpendicular to the movement of the underlying muscles. These grooves are a result of the skin's diminishing elasticity as we age. The largest lines that form when we smile are called nasolabial folds, which appear every time we smile and do not fade away as we grow older. Factors such as genetics, ethnicities, natural melanin concentrations, and oil production can affect how quickly these smile grooves will start to appear. Ultraviolet radiation exposure from sunlight is the number one cause of wrinkles, so it is important to protect the skin with a sunscreen that guards against both UVA and UVB rays. Keeping the skin well hydrated by drinking plenty of water and using a moisturizer can also help maintain its firmness and elasticity. Retinol-based creams are effective at promoting the formation of new skin cells and increasing collagen production to slow down the appearance of wrinkles. While limiting smiles may reduce the formation of grooves, it is not recommended as smiling has many immune system-boosting and stress-lowering benefits.