From Yahoo Sport:
Cristiano Ronaldo has the mental age of a 12-year-old, according to former Manchester United teammate Mads Timm, though he believes the Real Madrid star benefits from his selfishness.
Timm spent six years at Old Trafford from 2000, but made just one first-team appearance, coming on against Maccabi Haifa in the Champions League and had loan spells at Viking, Lyn and Walsall before his departure.
The Dane may not have had a prosperous spell at United, but he remembers sharing a dressing room with Ronaldo and pointed out the Portugual international's self-centered mentality.
"He's completely indifferent to the collective side of the game," Timm wrote in his biographyRed Devil."It was 'me, me, me'. Today, after so much success, he can still get annoyed when one of his team mates scored instead of him.
"Mentally, he reminds me of when I was a 12-year-old. I think he doesn't care what people think of him and that's one of the reasons why he has been able to survive in professional football."
But Timm, 31, was in awe of Ronaldo's confidence and said he struggled whenever he came up against the three-time Ballon d'Or winner in training.