> You have forgotten how to focus It could be due to aging. As people age, it gets harder for the body to release dopamine in anticipation of getting something

> You have forgotten how to focus It could be due to aging. As people age, it gets harder for the body to release dopamine in anticipation of getting something we done, especially for things that we are familiar with. As a result, one loses focus because of no trickling joy. "Been there done that" in a way is truly a curse. My own cure is always finding new things to tackle, and tackle only fundamental problems. Of course, my fundamental problem can be trivial to another smarter engineer. The key is to keep myself excited and therefore focused instead of how deep the problem is. The downside of this approach, though, is that I may have to switch jobs, and I need to work hard to keep myself healthy to have enough energy.