[nabnob]

Hmm, I've experienced the same thing. My hunch is that this is related to spending long periods of time in front of a computer, with internet addiction gradually making my ability to focus worse and worse. I honestly think I was better at reading difficult material when I was a teenager.

I think you just have to retrain your brain to focus in other ways - exercise is shown to improve learning and brain function. There's definitely a relationship between physical health and mental health, and I'm guessing that physical health is an area that a lot of us software devs are neglecting.