As many have said already, it could have one or several of many different causes but aging. Cognitive decline once happened to me at age 35: it was anemia (bloo

As many have said already, it could have one or several of many different causes but aging. Cognitive decline once happened to me at age 35: it was anemia (blood deficiency), caused by colon cancer (long cured) If the problem is serious, by all means do see a physician. He should be able to diagnose burnout, if nothing else -- which I believe is the most probable cause. There are many programmers in their fourties and older that do fine. Don't believe the agists.