mid-teenPronunciation: (mid'tēn'), [key]
of, pertaining to, or characteristic of a person 15–17 years old: specializing in mid-teen clothes.
a person 15–17 years old: an ad campaign aimed at mid-teens.
numbers, amounts, ages, etc., midway between 13 and 19: He started at a salary in the mid-teens.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.