Procedure to Get a More Defined Jawline?

I am in my early 30's, pretty thin/toned throughout my body, yet my my jawline is very undefined. What type of procedure would help give me a more defined jawline to get rid of my cheek and neck almost being in the same plane? When I saw more defined, I don't mean a larger chin in profile, not interested in a chin implant since I'm happy my chin, it's more of the jawline on the sides of my face and going back to near my earlobes.