The Class of '92 tells the story of United's FA Youth Cup-winning side and follows them until the club win the Champions League Final in breathtaking fashion against Bayern Munich in Barcelona in 1999.
It looks at the impact made by Beckham, Paul Scholes, Ryan Giggs, Nicky Butt and the Neville brothers.
"It makes me feel old watching it back now," Beckham told Sky News.You don't have to be a Manchester United fan to enjoy it. There are a lot of laughs in there and some seriousness too.
"There are moments too when people who know us well will get choked up watching it. There's so much in this film."
While Beckham will soon start work on his new MLS club in Miami, the other five are all actively involved in the game too, albeit not at owner level.
Phil Neville is now a United coach, Giggs is still playing at 40 years of age, while Gary Neville works with the England coaching set-up and for Sky Sports.
Butt coaches United's under-19 players and is often helped by Scholes.
The documentary also looks at the re-emergence of Manchester in the 1990s through music, as well as football.
"The likes of Oasis were exploding onto the scene and The Stone Roses too, the whole Manchester vibe was incredible," said Giggs.
The music, the clubs, it was a great time to be coming into the first team."
Manchester DJ Dave Haslam says the class of '92 helped bring football to a new breed of supporter.
"What happened quite quickly is that you had the Ryan Giggs bedspreads and posters and it was like he was a member of Take That," he said.
"It gave United a market that they wouldn't have had before, people who were not necessarily into the world of working class football culture."The challenge ever since has been to find an equally talented group of youth players to turn into Premier League stars.
Phil Neville said: "If it's going to happen again then it will happen at United. There are not many clubs who will give youth its opportunity."
The Class of '92 is in selected cinemas now and available to buy on DVD from Monday.
