For both men and women, a beautiful, well defined jawline might be one of the most sought after treatments. Although the perfect jawline differs widely for men and women. For men, the jawline is wider, and the angle should be around 90 to 100 degrees. For women we want a slimmer jawline to help create a more heart shaped or oval facial shape. The angle should ideally be around 120 degrees. Both sexes will also notice that they will lose the youthful sharpness in their jawline as they start to age. This is mainly due to loss of bone in the mandible or lower jaw bone.