From the photo, this looks more like early lower-face laxity/jowling and cheek volume change than severe facial aging. You may be a candidate for a lower facelift or mini/lower-face lift, with or without a neck lift depending on your neck skin, platysma bands, and under-chin fullness. The exact technique, such as SMAS or deep plane, should be chosen after an in-person exam because photos do not show skin thickness, tissue mobility, or neck anatomy well enough. At age 40, it is also important not to over-operate. Sometimes volume adjustment, skin resurfacing, neuromodulator treatment, or targeted filler/fat grafting is part of the plan, while surgery is reserved for true laxity. If the change really happened suddenly over only a few months, ask your doctor to consider weight change, dental/bite changes, hormones, stress, or other medical factors before proceeding. A consultation with a board-certified facial plastic or plastic surgeon can show whether a small lower-face lift or a more complete face/neck lift is appropriate.