What is is 19 a teenager?

Yes, 19 is considered a teenager. The teenage years are generally defined as the period between ages 13 and 19, when a person undergoes significant physical, emotional, and social changes. At 19, individuals are still in the latter part of their teenage years and may still be experiencing some of these changes. They may also be preparing for or attending college, starting a career, or living on their own for the first time.