is a boy
He's a complicated guy.
He's not a boy anymore.
Tom es un muchacho muy alto.
Tom is a very tall boy.
Él es un muchacho aplicado en su clase.
He is a diligent student in his class.
He's a very wild kid.
Su novio es un muchacho simpático.
Her boyfriend is a nice guy.
Es un muchacho muy prometedor.
He’s a very promising young man.
Tom es un muchacho de trece años.
Tom is a thirteen-year-old boy.