Options to Correct a Sagging, Wrinkling Double Chin?

Neck rejuvenation is a specialty unto itself. When I counsel patients about improving the neck area I make sure that they understand that the neck has several layers that need to be individually addressed to optimal improvement. The first and, in my opinion, the most important layer, is the skin. Taking care of your skin will make the best statement about you in the end. To this end, I usually recommend healthy water intake, sunscreen with an SPF>30, and medical grade skin care product usage.
In my practice I further improve the skin through the use of laser skin resurfacing and prefer to use Active FX fractional carbon dioxide laser to gently tighten the skin over the course of 3-4 treatments. The next layer to consider is the fat layer directly under the skin. The best way to deal with it is to perform small cannula liposuction.
I use VASER ultrasound technology to try and get some additional skin tightening with the loss of the fat. It is not absolutely necessary though. The final layer to consider is the underlying muscle layer known as the platysma. The platysma muscle with time and use become loose and starts to sag. Here in Denver, women are extremely active with yoga and Pilates.
Those disciplines require some unusual head positions that stretch those neck muscle out and, in my opinion, contribute to sag. A neck lift procedure helps tighten the underlying muscle layer and gets rid of excess old skin to give you better definition to your neck. Hope this helps.
Dr. Shah

Excess fat is removed under the chin with liposuction, but you will probably require a facelift to remove the excess skin that will remain. Your surgeon can tell you if a chin implant would be of benefit as well. Unfortunately, with age and gravity, everything is headed south. Exercise can help tone muscles but won't correct the sagging skin.