Malcolm: Okay, I see that you're... a writer from... Phoenix, Montana. You've come here to be inspired by the English countryside and to get away from the hustle and bustle of your life in the U.S. of A.
Greta Evans: No.
Malcolm: Close.
Greta Evans: Um... not at all. No.
The Boy (2016)
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Directed by: William Brent Bell
Starring: Lauren Cohan, Rupert Evans, James Russell, Jim Norton
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Answer: First, the other answer stating his voice box was damaged by the fire is pure conjecture, and also isn't supported by the fact we hear Brahms speaking with an adult voice at one point in the climax. But to answer the original question, it's really not that hard for an adult to mimic a child's voice. Heck, voice actors do it all the time. Presuming that he's been stuck in the walls since the fire when he was a boy, he probably is used to speaking and acting like an overgrown child much of the time as he never really "grew up" mentally (as evidenced by his clumsy body language and attitude), only slipping into his "adult voice" when he becomes overtly irate or loses control.
TedStixon