u/KawaiiHamburger

So, my turtle is basically a grandpa. He’s 27 years old and we know that he may be near the end. He’s a yellow bellied slider (got gifted him before it was illegal to own them.) He’s always struggled to shed his scoots but now he shed some bigger chunks and this stuff is on it. Have no idea what this is and would just like some advice. Also included pics of what he looks like. Any help is appreciated thanks!