When does a yellow belly slider shell get hared?

A yellow-bellied slider's shell can harden as it matures, typically becoming more rigid around 3 to 5 years of age. During this time, the turtle's carapace (upper shell) undergoes growth and calcification, resulting in a harder shell. Proper diet, hydration, and environmental conditions play crucial roles in this process. It's important to provide adequate UVB lighting and a calcium-rich diet to support healthy shell development.