The former team-mate: Paul Parker, former colleague of Giggs at Manchester United and Eurosport-Yahoo! blogger
"I think it's absolutely brilliant what Ryan Giggs is doing as he turns 40: still out there, playing and making a difference, showing that with the right attitude you can carry on your career far beyond what most people might think.
"It's helped him enormously to be at such a great club, of course, but more than anything Ryan has always looked after himself to make this happen. Looking after his body, his habits, and more than anything keeping his desire and passion burning have been instrumental in prolonging his career.
"He's very much like Alex Ferguson in that last respect: he has a constant thirst for medals. As soon as he had one then he wanted another, and there's not many animals like that still around today. With the amount of money players get, all too often they're happy to sit back and enjoy their lives once they've picked up a bit of silverware.
"I wouldn't say that was anything particularly about Ryan, though: it's a Manchester United trait, that constant thirst for success. I think Fergie probably saw that in Ryan and probably helped bring it out.
"That's what'll keep you playing that long: you're never content, and one is never enough."
The Scout who discovered him: Dennis Schofield, the milkman and part-time scout for Manchester City who first discovered Giggs at the age of 8
"I was a milkman in those days, which was handy because after my round I would often park my float and watch the kids playing for their school teams," Schofield told the BBC.
One day, Schofield was on his rounds and passed Grosvenor Road Primary in Swinton.
"I saw some pupils walking out of a door with their football boots on and decided to stick around," he said. "They had an eight-year-old on the left wing who ran like a gazelle and was dynamite on the ball. His name was Ryan Wilson."
That youngster later changed his name to his mother's surname, Giggs, but the talent remained the same throughout.
"Even at that age I knew he was an absolute gem," Schofield added.
"His dad was a class act as a rugby league winger and young Ryan had his speed and balance to swerve past people as though they weren't there.
"I've been a coach and scout for over half a century and he was the best prospect I'd ever seen. He had skill, control and movement, and he was destined for the big time. I'd seen Stanley Matthews play in his pomp and he had the same characteristics.
"Opposition players would often come up to me before a game and ask if Ryan was playing… If he wasn't available, they were genuinely disappointed because they wanted to say they'd been on the pitch with a future star."
The fellow "golden generation" star: Nicky Butt
Nicky Butt told the Daily Mail how he was convinced that he'd get the better of Giggs when they first met as teenage rivals.
"I played for Manchester boys, Ryan played for Salford boys. I used to see his name in 'The Pink' [the Manchester Evening News ]," Butt told the Mail.
"I used to think to myself, 'He must be some player — he’s in it every week.' Me being me, I thought, 'When I get to United, I’ll show him.' But "I played against him in the first session and didn’t get near him.
"I thought I was never going to make it if that was the standard. That’s how good he was."
The former manager: Alex Ferguson
"He's a unique freak. He'll play for another two years - trust me… Twenty-three years in the first team, it is unbelievable.
"I said to him [when he signed his latest contract]: 'I expect a bill from your mother, all those sandwiches and teas she used to make for us,' [back in the days] when I went to his house every week trying to get him to sign a schoolboy form. It seems a long time ago but what an incredible career. Absolutely fantastic."
The current manager: David Moyes
"People mention his age but all you should talk about is his fooball ability. He is an unbelievable footballer - and you could say he is getting better…
"He is a wonderful player and I am really fortunate to be working with him. He will tell us when he has enough, or when he thinks his time is up. But his performances since I came have been excellent."
The journalist: Matt Lawton of the Daily Mail
"One of my favourite memories dates back to a piece I subbed when I was working for a local paper in Bristol back in the early 90s," Daily Mail football correspondent Lawton wrote in the paper.
"One of our reporters was sent to The Cliff to write a profile on this new wonder kid at United, and I remember how flash we all thought it was that he drove a Golf GTI. How times have changed in football."
The man himself: Ryan Giggs on how long he'll carry on
"I was with Brucey [Steve Bruce] the other day,” Giggs told The Times.
"He asked if I was still enjoying training. I said, 'Yes.' He said, 'Well, carry on then.'
"I still enjoy training, the buzz before the game, the buzz when we win. As long as that lasts, I’ll carry on. It might change in the next few months. It might not. We’ll just see.
"I envy [my old team-mates] when we go out for a meal. They’ve got a glass of wine and I’ve got a still water, boring. They’re kicking on and I’ve got to go home to bed.
"I think once you’ve finished, you’ve made peace with yourself, you’re ready for it. I’m sure that will be the case with me when the time comes — relief at not having to go out and train and not having to think, 'I’ve got a game in two days. Right, pile the pasta down.' When that time comes, there will probably be that relief that they’re enjoying at the moment…
"I don't know what the younger lads think of me. When I was 17 and 18 I thought 31 was ancient. Here I am at 40.
"It can be hard sometimes but I am still enjoying it. As long as that is the case I will carry on."
The legend: Former Manchester United star Denis Irwin
"That volume of medals [that Giggs has won] will never be broken. The number of games? That would take some beating as well.
"What he has done is unbelievable. That kind of longevity at such a top club. This is no run of the mill mid-table team or one in the Championship. You are talking the very highest level for the last 23 years.
"The amount of games. The number of trophies. The dedication needed to go the distance and challenge yourself every year. To come back for pre-season training and keep going with the same intensity shows what type of player and person he is."