Great Hammerhead Sharks are viviparous, meaning they give live birth. Females are pregnant for around 11 months, before giving birth to a litter of 6-56 pups. When they are born, the pups are around 50–70 cm (20 to 28 in) long. Males mature when they are about 2.3 to 2.8 meters long, and weigh around 51 kg. Females mature when they are about 2.5 to 3 meters long, and weigh around 41 kg. Great Hammerhead Sharks live for around 20–30 years, but the oldest Great Hammerhead Shark ever found was said to be 40–50 years old.