But, at the launch of his autobiography My Manchester United Years, Charlton was critical of Beckham's glamourous lifestyle and his move to LA Galaxy.
"I think Victoria's lifestyle affected his game," said Charlton. "He was a really great footballer and had a terrific talent, but everyone is different and his lifestyle has gone in a different direction.
"When I first saw him, he wanted to be a footballer more than anyone I have ever seen. I wonder sometimes if he thinks what has happened. I would rather he was still playing in England, but he is in America now. He is committed to being there and will earn millions of pounds, so good luck to him."
Charlton still finds it difficult to attack Beckham, 32, and thinks the LA Galaxy midfielder will eventually go on to get the additional three caps required to hit the century. "He is only young yet, so he will probably make it."