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This story presents a version of extreme longevity that's a bit different than most (Heinlein's Lazarus Long and so on). Gaius Titus Menenius was born a Roman citizen, but realized early in his life he was not like other people. He grew up very slowly, less than a tenth the speed of normal people. So it isn't until the 1950s that he becomes sexually mature and able to father children. Now all he needs is an appropriate mate.
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