Which age group was found to benefit the most from language enhancement?

Age group that was found to benefit from language enhancement are the children who are in the kindergarten, whose age are from 5-7 years old. It is in language enhancement, it is a way of being able to understand and develop language skills in order to communicate. The reason why they benefit most because as they start to go to school, it is essential for them to learn this because it is a way of communicating to their teachers and classmates. It is also a way for them to understand and cope up with their studies as they start to go to school.