When is a language considered dead?
Language death
A language is often declared to be dead even before the last native speaker of the language has died. If there are only a few elderly speakers of a language remaining, and they no longer use that language for communication, then the language is effectively dead. A language that has reached such a reduced stage of use is generally considered moribund. Half of the spoken languages of the world are not being taught to new generations of children. Once a language is no longer a native language—that is, if no children are being socialized into it as their primary language—the process of transmission is ended and the language itself will not survive past the current generations.
Language revitalization
John McWhorter has argued that programs to revive indigenous languages will almost never be very effective because of the practical difficulties involved. He also argues that the death of a language does not necessarily mean the death of a culture. Indigenous expression is still possible even when the original language has disappeared, as with Native American groups and as evidenced by the vitality of black American culture in the United States, among people who speak not Yoruba but English. He argues that language death is, ironically, a sign of hitherto isolated peoples migrating and sharing space: “To maintain distinct languages across generations happens only amidst unusually tenacious self-isolation—such as that of the Amish—or brutal segregation”.