Is it possible to be diagnosed with adhd at the age of 19?

Complete Exam: ADHD is very common, and many people who think they have ADHD will benefit from treatment at any age. However, over 1/2 of adults with ADHD have a 2nd mental health issue. So one must get an evaluation by someone who is trained and experienced in Adult ADHD, and you must have a thorough and comprehensive evaluation to sort everything out., including other possible medical problems.

Yes: If a person has been symptomatic as a younger child or has found it necessary to use strategies to succeed in school, and especially if the problem is inattentinve, the diagnosis may be delayed until the late teens or even early 20's.