Typically turtles live to be anywhere between 10 and 100 years old. However how long a turtle lives also depends on whether or not they are turtles or tortoises and also can depend upon the particular species as well as their environment, diet, and health. It is evident that turtles can and do live for longer periods of time than most other living beings or animals on earth, as they have been around long before the dinosaurs inhabited earth and are estimated to have been around for at least 270 million years so far.
Some sea turtles have been said to live to be the age of 150 or so while land turtles have been said to be able to reach the age of 110. The large tortoises from the Galapagos Islands are one of the species that can live to be the oldest, with the ability for some to live for more than 200 years. Some American box turtles have been documented over the age of 100 years old. Most sea turtles will live to be at least 75. Your common domesticated turtle, for example red-eared sliders usually live to be about 40 years old or more if they have received proper care and are healthy.