Hi, thank you i posted his/underside in the first comment but i shall attach it here also, thankyou for replying ☺️Hello, and a very warm welcome to Tortoise Forum to you and Munchkin.
I would guess at 10 years , but that's entirely guesswork, but certainly an adult.
One can't be certain unless you have a hatch date.
Can you post pictures of the underside and particularly the tail area so we can determine the sex ?
Ayee, thankyou.. He's about 8 yrs (going off unreliable hatching info) someone else estimated 10yrsLooks like a female but they always do from the start!