A facelift is a surgical procedure that's meant to tighten the skin of the face in order to make a patient look younger. Wealthy people who hate their wrinkles may be tempted to have a facelift.
Many older actors in Hollywood give into the temptation of having a facelift, instead of accepting the facial changes that naturally come with age. But facelifts are very expensive, can be dangerous, and frequently result in a strangely expressionless visage. A figurative facelift is anything that improves something's appearance: "While I was away, my sister gave my boring bedroom a facelift, painting the walls purple and replacing my old bedding."