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This article discusses the "Critical period" in language acquisition – based on the theory that children are born with the natural ability to learn language; an ability that gradually fades or disappears. According to this theory, children who are not privy to normal language stimulation during childhood miss their chance to acquire a language "perfectly".Critical periods do not only exist in language, e.g. children and other young animals need to receive visual stimulation for their vision to develop. The beginning of this article considers difference in opportunities for research, and thereby the state of knowledge concerning the critical period in vision, compared to language acquisition. The difference is based mainly on two factors: on the one hand, animals have been studied to elucidate the critical period in vision – an option that linguists do not have – and, on the other, it is quite common for children to lack visual stimulation, i.e. due to cataracts. It is less common for children to grow up without language stimulation, although stories exist of children that, for one reason or another, were deprived of human interaction during childhood. The author uses this opportunity to provide an account of two such stories, in a more detailed fashion than would be necessary to define the critical period in language acquisition. These are also stories of violence and questionable work methods for the sake of science. This is followed by a discussion of deaf children as, in the past – as well as the present day – it was common for them not to receive appropriate language stimulation from the beginning, i.e. via the use of sign language. The examples are so many that late language acquisition by deaf children can shed light on the critical period in language acquisition.Many have discussed the critical period in language acquisition but emphasis is often placed on that which has remained unlearned. This article asks rather what can be learned and whether language structure can be established despite a late start for the language acquisition process.