Can someone get ADHD in their teenage years?

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ADHD (attention-deficit hyperactivity disorder) is a developmental condition which is noticeable since early childhood. Symptoms like hyperactivity, impulsivity, inattention will be present before the age of 12 years. Parents and teacher would have commented about it even in nursery and early primary school years. It is unlikely for someone to develop to ADHD in teenage years without having any symptoms before. Other causes like anxiety, too much stress and pressure, family, and social problems need to be ruled out. Also, important criteria for diagnosis is functional impairment like you may not be able to do well in academics and not able to achieve your potential. But you report doing well. So ADHD looks less likely. If you have any other concerns, discuss with your parents and family and consult your doctor.