[zanny]

Some people cannot think analyticalally enough to maintain the state of a program in their head. This is why freshman CS classes can see retention rates in the single digits. You adapt your brain doing it over a long enough time, and when you start doing it early in life you evolve your brain to suit the task, but for anyone who lacks the critical thinking and logic to think programatically the later in life you are the less likely to be able to ever internalize it you get.