When children are young, apart from natural instincts and biological aspects, their brains are virtually blank slates
Language Differences: Age
When children are young, apart from natural instincts and biological aspects, their brains are virtually blank slates. Thus, as they develop, their behaviors and speech also develops, depending on their environment. So it is factual, that when they are young, they do not have a properly developed vocabulary, have a lower rate of speech motor control, and have poorer sentence structure and grammar. All these factors play a part in the language difference between, say, a five year old child and a 20 year old adult.