Will Thermage Tighten Minimal Sagging Under Chin and Upper Neck?

I am a 39-year-old female, very fit (lost all my pregnancy weight and am in excellent shape). However, I now have a bit of a "turkey neck" just beginning to form, not enough to be that obvious from the front, but enough where I'm now insecure of my profile and how I look at certain angles. Can Thermage tighten under my chin and upper neck, since it's minimal at this point? I don't want to have a Neck Lift yet, if I can get away with it. I have nice skin and no other aging on my face. If not Thermage, what are my options to fix this the best? Thank you for your time!