Sir Alex retired as manager at Old Trafford ten years after that .
A 14 - year - old David Beckham signs schoolboy forms for Manchester United 1989 and starts the relationship with Alex Ferguson that was to last until Beckham left to join Real Madrid in 2003 .
Alex Ferguson Alex Ferguson retired as manager at Old Trafford ten years after that .
A 14 - year - old David Beckham signs schoolboy forms for Manchester United 1989 and starts the relationship with Alex Ferguson that was to last until Beckham left to join Real Madrid in 2003 .