"He never talks about it and I wouldn't deem to talk about it myself, really. What I want is for it to continue the way it is at the moment," said Charlton.
"But we all get older and Alex will get older, the decision will be made and it will be a sensational performance because he has a great talent for winning.
"He wants to win and I think some of the newspapers would love to find out what Alex is going to do with his future. But I can't help you, because I don't know.
"I don't ask any questions, either, just in case I trigger something!
"But he's been marvellous and everything that Manchester United wanted. He's been a major success and is the greatest manager there's ever been. It's unquestioned.
"But if you wanted to find out when he's going to change and have someone else in command, the only person who will ever give you a proper answer is Alex."