I am not sure about the age of my tortoise..he's a bout 4 inches long. I have UVB/heat lighting and he eats a mix of Spring Mix, Mustard greens, collard greens, and turnip greens, thyme sometimes, working on growing more weeds as we speak. For him, would sprinkling cuttlebone on his food once a week be good enough or do I need to buy some more supplements for him?