Halle (dpa) - The world's oldest known sloth, 50 years old, enters the Guinness Book of World Records. "We requested this for Paula and it was confirmed," said Jutta Heuer, who runs the stud book of these animals for Europe, the German Press Agency. The two-toed sloth lady has been living in the Bergzoo since 1971 and celebrated her birthday in June. "There is no specimen known in zoos or the wild which has more years under its belt."