Ferguson has been in charge since 1986 and turns 69 at the end of the year with speculation rife that he will call it a day, However, Giggs, who first met Ferguson as a 12-year-old schoolboy and has been an important part of his manager's haul of 11 Premier League trophies, three FA Cups and two Champions League titles, thinks he is not done yet.
"The manager is as good as ever and will go on for a long time," he told the News of the World. "To be honest I can see him as a manager of United in five years' time, easily, even at 75.
"As long as he is healthy, he'll have the desire to carry on. He has a great team around him and he has his passions away from the game, like horse racing, so when he comes back to football he is always refreshed.''
Giggs, 36, has played for his entire career under the Scottish boss and now claims that their relationship has never been better.
"Things have changed - he has mellowed, he isn't anywhere near as frightening as he was 20 years ago," he said. "I have known him since I was 12 years old. So it has changed from me just being a kid looking up to him, to being an experienced player he talks to - and from whom he actually asks advice about certain players and situations.
"It's always been a good relationship, but it has never been better than it is at this moment. Mind you I am a better player now than I was in my early 20s, I have lost that explosive pace where I could knock the ball past a defender and knew I would beat him. "I have to think about my game more and use the ball a lot better now. In my head I still think I am about 25 - I don't feel like the old guy in the dressing room. I can relate to the young players - we're footballers who share a lot of the same interests."