"Not your fault. It's just the way it is. At least I don't have to worry about getting old physically or diseases." The only way he can get sick is by eating too many shadows.

Granted being physically 16 forever isn't great. Though it's better than being actual dead rather than undead.

He does nod at the last part. "It's also why I continue to eat most normal food even though it doesn't do anything for me. It helps to feel human."