The folds that develop around the mouth are some of the deepest on the face. Here's the mark of forty years on a woman's face; the particular pattern shown here seems to be more common with women than men. Though the wrinkle pattern is similar to that of the mouth in certain expressions, we see the mouth as neutral because the LBL, the lip shape, and the shape of the cheeks are all relaxed.
At age twenty (top), the mouth corner is marked by a short, oblique crease. The slight mound outside the crease (A) is the "node"—a thickening in the face where a number of the mouth-moving muscles converge. Its form helps to define the mouth corner. There are hints of the way the face will look in forty years in the very soft turnings alongside the mouth and on the cheeks; the crease alongside the chin falls at a natural plane turning between front and side.
At age sixty (bottom), deep lines around the mouth have appeared. The corner of the mouth crease has deepened and lengthened, making the LBL appear to continue much further than it does; it actually ends at (B). From there what we see is a skin fold, not a real gap. The sharp turning is where a separate crease, the commissural fold, begins (C). It's often one of the deepest wrinkles on the face. It runs straight down alongside the chin, marking the border between front plane and side. The nose-to-mouth fold has also deepened (D); on many faces this joins with the commissural fold, making one long crease from nose to chin. Other changes with the years include a deeper crease under the mouth and a fuller line of the jaw.
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