Question: How long do sharks live? Answer : Scientists aren't sure how long sharks live. The usual way to figure out an animal's age is to study its teeth. But sharks grow and shed as many as 50,000 teeth over their lifetimes, so you can't judge their age that way. Examining a shark's vertebrae can give an approximate age, and researchers have tagged some sharks to study their life and age. Using this information, experts think most sharks live about 25 to 30 years. Great White Sharks and Tiger Sharks live about 40 years. The Spiny Dogfish Shark may live up to 100 years. But many sharks have short lifespans because of over-fishing by humans. We're more of a threat to the sharks than they are to us.
