Someone says to you: " You look younger, did you have a facelift?"

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Sometimes there are people who are so candid, they're rude. What and how would you answer an acquiantance who comes up to you and says : " You look younger , did you have a facelift?" She knows fullly well, you could not have had a facelift. Do you remain speechless, walk away, or do you come up with something like:" I went to the surgeon who have done your face..." etc? What is the mature way of handling this situation? Thanks for any input.