context: Whales on average live for 40 to 90 years, depending on their species and rarely achieve more than one century. Recently, a piece of string used by 19th-century whale fishermen was found in whales in Alaska, indicating that the whale was between 115 and 130 years old. The whale's eyes, along with a piece of harpoon, showed the age of 211 to one whale, making the whales also the longest living animals. . The whale's tail can also be a sign of recognition, as is the whale with its back.
question: How old are the whales?
answers.text: 40 to 90 years