A teenager is a person between the ages of 13 and 19. It is a time of major physical, emotional, and social changes between childhood and adulthood.
The word is built from 'teen', as in 'thirteen' to 'nineteen', plus the suffix '-ager', modeled on 'teen-aged'. It became common in the mid-20th century as societies started seeing this age group as a distinct stage with its own culture.
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