“How long do the results of double chin plastic surgery last?”

Thank you for your question. The answer to this question depends on the method that is used to treat the double chin. The double chin is usually the result of excess fat under the chin and excess skin. A procedure such as liposuction, Kybella injection, or cryotherapy is usually done to address the excess fat. However, at times once the fat is removed, the excess skin will begin to sag. To address this issue a neck lifting procedure should be done. If a neck lift is combined with a fat reduction procedure, then the results should last a life time. you will continue to age and may need touch-up procedures but the removal of the fat and the skin and suspension of the muscle will last for ever.

Depends on what procedure you had. Liposuction vs neck lift or both.
Certainly, the later last longer. Only if there is no weight gain significantly.
10 - 15 years.

This various with the patient and which procedure you are talking about, but most rejuvenation procedures of the neck are long lasting.