So much has changed, yet theHarry Pottercast’s bond remains.

In a behind-the-scenes look at HBO Max’sHarry Potter 20th Anniversary: Return to Hogwartsspecial shared exclusively with PEOPLE, Daniel Radcliffe, Emma Watson, Rupert Grint and more costars describe the surreal experience of catching up with each other 10 years after the finalPotterfilm.

“It’s been a long time since I’ve seen any of them,” says Grint, 33, as Watson, 31, adds, “It’s just been a joy getting to relive it all.”

Radcliffe, 32, says, “It has been lovely seeing everyone again and going like, ‘Oh yeah, we’re all doing great.’ "

Gary Oldman says of being back on the film sets, “All the memories of working here come flooding back. It was like it was last week.” Costar Matthew Lewis agrees, saying, “It doesn’t feel like 10 years ago. At all.”

“There’s so much of life to take in that happened in those 10 years,” says Radcliffe. “Every part of my life is connected to Potter. And we’ve seen even more how much it means to people and what a part of people’s lives it is. It means even more now, and I’m able to appreciate how special that is.”

Harry Potter, Daniel Radcliffe, Emma Watson, Rupert Grint

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Theanniversary special was announcedlast month in a press release that teased it will “tell an enchanting making-of story through all-new in-depth interviews and cast conversations, inviting fans on a magical first-person journey through one of the most beloved film franchises of all time.”

Harry Potter 20th Anniversary: Return to Hogwartsis available to stream on HBO Max starting on Jan. 1.

source: people.com