These vertical lines appear in between the eyebrows when we frown often referred to as the “11’s”. These lines primarily appear due to how we express our face. Continuous muscle movement at that area results in skin creasing, and over time leads to static lines at rest as well as when we are expressing our faces.
As we age collagen and elastin production slows, which results in fine lines and wrinkles appearing and becoming permanent. Over time lines become more visible and permanent.