Pop superstar Madonna is so terrified her toned body may begin to show the telltale signs of ageing, she's considering going under the knife. The yoga-loving 47-year-old hates the thought of being cosmetically enhanced, but admits a quick fix answer to age and gravity does have its attractions. She says, "I sure don't rule it out, although I don't want to be made up of silicone, plastic and man-made fibre."