As we grow older, our skin starts losing its elasticity. So the expression lines that appear on the face when we express our emotions start becoming static. Forehead lines/wrinkles are a common concern among people in their late 30s. This article  explains why forehead wrinkles appear and how can one get rid of them clinically without any side-effect.

Link: https://www.onlymyhealth.com/forehead-wrinkles-causes-prevention-and-treatment-1600684790