At what age does a teenager stop getting taller?

There is no specific age a teenager will stop getting taller. One factor is your gender, females tend to go through puberty a lot earlier than males. Males enter puberty about the time they become a teenager, some females will start before 13 years of age. It also depends on the individual and their genetics because even though the average female starts puberty earlier than males, there are always females out there who sometimes are still going through puberty in their early twenties.