The most critical period of acquisition and development of language is

Early childhood (roughly birth to age 6) is universally recognized as the critical period for language acquisition and development. During this period, the brain shows maximum plasticity for language learning, and children acquire vocabulary, grammar, and pronunciation at a remarkable pace. Research by linguists like Noam Chomsky and Eric Lenneberg supports the existence of this sensitive period. While pre-natal exposure to language sounds occurs, actual language acquisition begins after birth and peaks in early childhood. After this period, language learning becomes progressively more difficult.