hi roystanley ,
the average life span of any type of tortoise is about the same as the average human life span ,some have even been know to live upto 150 yrs of age !!!!
sadly mine past away earlier due to it having a tuma in her chest she only lived for 15 years but i time passes and i need to help others in the same situation !!!!
really you dont want to lose any animal at an early stage its heartbreaking when it happens ...!!!!!!!!!!!!!!!!!
i hope you found this info a extra step to the answer you were looking for !!!!!!!!!!!!!!!!!