teen
noun
[ tiːn ]
• the years of a person's age from 13 to 19.
• "they were both in their late teens"
• a teenager.
• "managing troubled teens has become a difficult task for parents"
teen
adjective
• relating to teenagers.
• "a teen idol"
Origin:
late 16th century: as plural noun, as an independent usage of -teen. Sense 2 of the noun dates from the early 19th century, and the adjective from the 1920s.
-teen
suffix
• forming the names of numerals from 13 to 19.
• "fourteen"
Origin:
Old English, inflected form of ten.