Is it normal that a boy cant talk in the age of three?

No, this is not normal. Children typically begin to speak their first words between the ages of 12 and 15 months. By the age of three, most children have a vocabulary of several hundred words and are able to communicate in simple sentences. If a boy cannot speak at the age of three, it is important to seek medical attention to rule out any underlying medical conditions that could be causing the speech delay.