Not as important as deformity and how much it bothers you.
If your double chin is due to fat and your skin quality is good, you can't predict totally how you will look after losing 20 lbs. A n indicatior may be photos of you when you were lighter.
Anyway face lift/neck lift operations are more challenging in men, but techniques are available to hide the scar and allow for hair to grow through it, so hair style changes are minimized. No guarantees can be made, but chances are good that you can achieve what you want.
If you are an appropriate candidate for the surgery, and you are motivated to have the surgery, your age is not that important.





