At what age does the fifth stage of first-language acquisition occur?

The fifth stage of first-language acquisition is known as the "advanced" or "detailed" stage, which typically occurs after 30 months of age. By this stage, children have developed a more complex understanding of language and can produce longer and more varied sentences. This indicates a significant leap in their linguistic capabilities, as they begin to understand and apply grammatical rules more effectively.

Prior to this stage, children go through several earlier stages, such as the cooing and babbling stages, where their language skills are still emerging and not yet fully developed. The stage after 30 months is marked by the ability to engage in more sophisticated conversations, use language for various functions, and express thoughts or emotions more clearly. As a result, identifying after 30 months as the appropriate timeframe for the fifth stage aligns with established models of language development in children.