How old do you have to be to be a teenager?
A teenager, or teen, is a person who falls within the ages of 13 to 19 years old. The word "teenager" is another word for an adolescent. When a teenager turns 20, they are no longer a teenager: they are no longer in that developmental stage.
13 years old
The first teenage year is thirteen years old. The word teen is derived from the last syllable of numbers thirteen through nineteen, hence “teen” years.
13. 10 to 12 is considered a tween and the teenage years are 13 until you turn 20
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