This modern classic of science fiction—first published in 1996—has been reprinted more than 15 more times since its original appearance, including in a Year's Best volume.<P> * * * *<P> It was her first, his seventh. She was 32, he was 363: the good old April/September number. They honeymooned in Venice, Nairobi, the Malaysia Pleasure Dome, and one of the posh L-5 resorts, a shimmering glassy sphere with round-the-clock sunlight and waterfalls that tumbled like cascades of diamonds, and then they came home to his lovely sky-house suspended on tremulous guy-wires a thousand meters above the Pacific to begin the everyday part of their life together.<P> Her friends couldn’t get over it. “He’s ten times your age!” they would exclaim. “How could you possibly want anybody that old?”