Because he transformed his body into a puppet.
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Because he is really a puppet. He's basically a puppet and a man mixed together. And before you ask how, his heart is the only thing keeping him alive.
Sasori is from the Sand Village.
Sasori looked different when he removed his cloaks. The reason behind this was because he hid the fact that he was indeed a puppet as well. Everyone else in the series believed him to be human.
Scorpion (Sasori)
he is young hes 28 years old
Thomas Sangster looks young because he has is mothers looks and she looks young for her age :)