How can you tell a sea turtle’s age?

Turtle skeleton, Australian Museum
Turtle skeleton, Australian Museum

There is no way to determine the exact age of a sea turtle from its physical appearance other than to establish if it is a juvenile or adult, depending on its size.

After it’s death, the age of a turtle can be determined by a technique called “skeletochronology”, whereby the humerus (arm bone) is examined. These bones reveal growth rings that allow the turtle’s age to be calculated.