There isn't really a way too tell age, my turtle is 6inches. I got her 3 months ago from someone who got her from someone ect ect. So From being passed around her age has been lost. Some turtles can grow too fast from poor diet, like too much protien, some turtles are stunted from poor care. Some where I read that you can count the lines on the shell for age. Yet some turtles shed the shell more then 1 time a year. Sassamo's shell is also deformed, so I have that too factor in, if both sides where the same length I'm sure she would be 7inches. So I am just guessing that she's 5-6yrs old.
My favorite things in the world:
1 res, 3 cats, 3 bunnies, 1 dog, 2 african clawed frogs, guppies, pleco, 30+ fancy mice, 2 hermit crabs and 4 small humans