At 39, a full facelift is not always the first or best answer for downturned mouth corners unless there is clear lower-face laxity. In the photos, there appears to be some downturn at the oral commissures and mild lower-face heaviness, but the images are limited and an in-person exam would be needed to judge skin laxity and facial support. For this specific concern, non-surgical options are often worth discussing first: a small amount of neuromodulator to the DAO muscle, careful filler around the marionette area or chin support, and sometimes skin tightening if laxity is mild. If the main issue is jowling, loose neck skin, or deeper lower-face descent, then a lower facelift or neck lift may be more appropriate. The right plan depends on whether the downturn is caused mostly by muscle pull, volume loss, dental/chin support, or skin laxity, so a consultation with a facial plastic surgeon who can assess you dynamically while speaking and smiling would be most useful.