>>121046339I never really believed BB had the disposition toward going bald, but more of the circumstances that lead to BB's situation in the Starfire episode lead to him going bald and fat.
At least not until he's Really old, when most people start losing their hair regardless.
Otherwise, he not only has a healthy diet as a vegetarian, not a vegan, but also has great excercise. He would probably also need to take in regular suppliments for hair health, or adjust his diet correctly to be able to take care of the needs his animal forms hair has.