Green sea turtle eggs are buried in clutches of 75 to 200. After two months, the hatchlings make a mad dash for water where they’ll spend the rest of their lives. Green sea turtles do not reach adulthood for 10 years or more, but they can live up to 100 years - talk about longevity! These animals get their name not from their shells, but from their subdermal body fat. Unlike many other turtles, they cannot retract into their shells.