What kind of revision do you recommend? Is it possible for sliding genio to have moved over time? (photos)

You can correct the chin 'asymmetry' with a sliding genioplasty and contour the jawline with tapering strips of implants to enhance and define the jawline. The 'jowel' area appears at your age due primarily to a reduced bone support; so that the soft tissue 'overlaps' the jawline more readily....

 A custom carved chin implant may be able to help improve some of the asymmetry that is present. Chin implants are manufactured in a large variety of sizes and shapes and  since they are made of Silastic, they can be custom carved to fit the patient's unique anatomy. For more...

Thank you for your pictures.  Yes, the projection and width can be changed with a sliding genioplasty.  This is slightly challenging.  I agree with Dr. Jamali that I do not believe that your chin needs to be widened.  

Thank you for your X-ray. I agree with Dr. Apply concerning your hyoid position in the X-ray.  There is not a surgical procedure to reposition the hyoid bone.  Your best best would be standard techniques that we have to improve chin and neck contour. Best wishes.

Thank you for your pictures. In my opinion, a sliding genioplasty to correct your chin asymmetry would be reasonable. You need to make sure that your jaw does not have this same asymmetry. I would visit with a board certified oral surgeon or board certified plastic surgeon. Best wishes.

Only you can make the determination if these procedures are beneficial for you. You should have computer imaging done before these procedures to help you make the determination if they are worth it for you. It is unclear in your question what procedures constitute 'Maxillofacial'.  I am...