You need to consult a clinical psychologist. Concentration problem may be due to some other problem at this age. After evaluation they will let you know how to get over of this problem.

Please do not self diagnose. Many ADHD symptoms can be seen during stressful periods

Hi, you can consult a psychologist and explain about your symptoms.

Yes you can go for professional consultation, assessment and therapy.

Hi... ADHD is usually diagnosed early in life. It is unlikely that you have lived up to 23 years of age without being diagnosed earlier. Still you can consult a Psychiatrist for detailed evaluation and diagnosis. Most symptoms of mental health illnesses are such that if you search them on internet you will find them existing in you. If you are facing issues focusing on your studies/work/career or if you are going through some personal life struggles, consider taking Counselling Sessions from a Psychologist to help you deal with them and develop necessary skills.

You can contact me. You ll get to know more in details about your problem after a healthy and elaborate discussion.