The average lifespan of sea turtles is about 80 years. Sea turtles outlive most research projects, so it is difficult to determine the average lifespan of these creatures.

Except for the flatback sea turtle, all species of sea turtles are considered endangered. Their predators include killer whales and tiger sharks. Birds, dogs and raccoons prey on turtle eggs and hatchlings.

Human activity is the main threat to sea turtles. Beach development encroaches on the sea turtles' habitats, and the noise and light produced by humans frightens sea turtles away from their nesting areas. Sea turtles die when they ingest trash found floating in the ocean, get tangled in fishing nets or collide with boats. Illegal hunting of sea turtles for their meat and shells is an additional threat.