Flatback turtles have the smallest geographic range of all seven marine turtle species, and do not undertake long, open ocean migrations. Flatback turtles (Natator depressus) live primarily on the continental shelf of Australia and nest only on Australian beaches. The flatback sea turtle can only be found in the waters around Australia and Papua New Guinea of Pacific. These turtles are typically found shallow waters less than 60 meters in depth along the coast or continental shelf of … Hatchling flatback sea turtles seem larger than most other sea turtle species. How long do sea turtles live? What we do know is that sea turtles live a long time (some can live up to 50 years or more) and have similar lifespans to humans. There are seven species of sea turtles on Earth: green turtle, leatherback, flatback, loggerhead, hawksbill, Kemp’s ridley, and olive ridley.Sea turtles typically live between 30 and 50 years, with some documented cases of sea turtles living as long as 150 years. Flatback Sea Turtles from Australia nest 4 times each season and lay 50 eggs on average, which are quite large compared with other sea turtle species. The actual documentation of the age of any species of sea turtle is difficult. Despite their limited range, probably less is known about this sea turtle species than the other six sea turtle species, which are more wide-ranging.