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…showed last 75 words of 949 total…later when the populations return again to tropical waters. Newborns are about 6.5 m in length and weigh 1800 kg. The young are weaned at 6 or 7 months when they are 11 or 12 m in length. Calves travel with their mothers to the winter feeding grounds. Females reach sexual maturity between 3 and 12 years old and reproduce every 2-3 years after. Full physical maturity is not reached until between 25 and 30 years. Fin Whales have a average life span of 60 years.