In America, the debate is no longer about whether surgery is normal; rather, it centers on what age people should be before going under the knife. New York surgeon Dr. Gerard Imber recommends "maintenance" work for people in their thirties. "The idea if waiting until one need a heroic transformation is silly," he says. "By then, you've wasted 20 great years of your life and allowed things to get out of hand." Dr. Imber draws the line at operating on people who are under 18, however, "It seems that someone we don't consider old enough to order a drink shouldn't be considering plastic surgery."
In the UK cosmetic surgery has long been seen as the exclusive domain of the very rich and famous. But the proportionate cost of treatment has fallen substantially, bringing all but the most advanced laser technology within the reach of most people. Dr. Davie, who claims to "cater for the average person", agrees. He says: "I treat a few of the rich and famous and an awful lot of secretaries. Of course, ￡3,000 for an operation is a lot of money. But it is also an investment for life which costs about half the price of a good family holiday."
Dr. Davies suspects that the increasing sophistication of the fat injecting and removal techniques that allow patients to be treated with a local anaesthetic in an afternoon has also helped promote the popularity of cosmetic surgery. Yet, as one woman who recently paid ￡2,500 for liposuction to remove cellulite from her thighs admitted, the slope to becoming a cosmetic surgery veteran is a deceptively gentle one. "I had my legs done because they'd been bugging me for years. But going into the clinic was so low key and effective that it whetted my appetite. Now I don't think there's any operation that I would rule out having if I could afford it."
According to the text, the reason for cosmetic surgery is ______.

A. being physically healthy
B. looking normal
C. investing for life
D. improving appearance