Does masturbating 5 times a day for several years during teenage or youngage affect memory ,concentration or brain in some way?

The only way : that it would effect your brain - is if you spent so much time doing it that you avoided your studies or other important life activities. Masturbation does not harm the brain.

NO: While 5 times a day is higher than average, there is no evidence that masturbation causes any damage to our brains or bodies. Clearly someone who does this has a high sex drive but may also be dong this to relieve stress. I'd consider exercise and meditation as other outlets for this energy. If experiencing problems with brain function see a good Dr. to assess. Homeopathy and Ayurveda may help.