Their consistency is, as I argue, down to the choices they make. Instead of going to bed at a reasonable time they stay up and play games. I know, I've been there. The next thing it's really late and you can't get up the next day, when you do you're a melon head.
To say someone who's been playing footy at a high level for a long time needs time to adapt is deceptive. Anderson knows what he's doing, problem is he can't be arsed to do it right, or at least help himself by living right.
He has moments where, yes, his youth is clearly a factor in his footballing decisions, much like Nani at times. That is excusable. But you can't excuse his lack of fitness and poor execution by crying "youth".