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onset

The onset of stuttering usually occurs during childhood, with some cases of developmental stuttering occurring up through the time of puberty. The median age at onset is at about age four. Onset occurring after puberty is usually attributable to extreme cases of physical or psychological trauma.
Credit

Definition reprinted with permission from Hood, Stephen B. (editor) available from Stuttering Foundation of America: Stuttering Words (Publication No 2: Speech Foundation of America)