Approaching his 71st birthday, and with over 26 years' service as United boss behind him, Ferguson's achievements at Old Trafford will be acknowledged tomorrow with the unveiling of a statue of the Scot outside the stand that also bears his name.
Amid other little signs, including the health scare Ferguson suffered in May, it has been suggested it could signal the end of his reign and this season will be his last.
But those who know him best do not give that impression.
And Charlton, who travelled back from Turkey with Ferguson after the defeat to Galatasaray, is putting no timescale on the departure.
"When we made the decision to go for him, we didn't in our wildest dreams think that it would last as long as this," said Charlton.
"But, from the beginning, he obviously made people aware of what he did and how he did it with regard to controlling players and how to work with (the club) management which is also very, very important.
"I won't see his like again, I'm certain of that. He was born to do this job and he's going to be with us as long as he wants.
"He's just a sensational manager, I keep repeating it, (but) others must look on in envy."
Midfielder Paul Scholes added: "He has been brilliant for every single player that's worked for him."