Legendary director Richard Linklater, who made the 12-year-spanning film Boyhood, has decided on his next years-long project. 

Linklater will charge an adaptation of the Stephen Sondheim musical Merrily We Roll Along that will be filmed over the course of the next 20 years. Leading the cast are longtime best friends Ben Platt and Beanie Feldstein, plus Linklater-regular Blake Jenner. 

The cast shared excited messages about the project, especially Platt and Feldstein, who have known each other since high school. Fans can't wait to see the film, but some were concerned about what could happen in the next 20 years. 

The two met in high school musical theatre classes and first starred together in Pippin.

Feldstein and Platt sang together for the first time since high school at a Golden Globes event, and sounded absolutely magical. So expect to hear more duets on par with this one in the upcoming movie. Feldstein wrote, "Thank you to the HFPA for giving me an excuse to sing with my husband @bensplatt for the first time since we were seventeen and I was playing his grandma in Pippin. I love you my bubba boy!!!!"

Ben Platt and Beanie Feldstein have been friends for over a decade, and now they have two more in front of them.

Platt shared the announcement, and wrote, "This project has already been one of the most special blessings of my life. Me, my favorite person @BeanieFeldstein & sweet @Blake_Jenner get to portray dream roles in this brilliant marriage of piece & concept courtesy of Rick Linklater & @mrramshaw2."

Feldstein also shared the post to her Instagram. Her adorable caption reads, "Me and you, pal. Me and you."

Some are using this as an excuse to protect the planet at all costs. 

"Now we just need to avoid total planetary collapse so that we can see this in 20 years," one person replied to an excited post about the movie. Twenty years is a long time to anticipate a movie with a cast like this one. There will be plenty more to see of Platt and Feldstein, though. The two have multiple projects currently in the works. 

This could very well be the director's last movie. 

Linklater is responsible for movies like Dazed and Confused, Boyhood, Everybody Wants Some, and School of Rock. The iconic director will be 79 by the time the movie is finished, so it could very well be his final project. "Richard Linklater is 59. Just an observation," one person wrote.

Another person started thinking about their own mortality upon hearing this news, "Nothing deepens the 'ole mid-life crisis like news that you may not live long enough to see the new Richard Linklater movie."

Platt and Feldstein have always been supportive of one another's careers, and now, they finally get to work together. 

The longtime pals have both gone on to have individual success in musical theater, movies, and on Broadway. Now, they get the chance to work together, for 20 years on top of that. Platt shared a sweet series of photos of the two for Feldstein's birthday. 

"Happy 26th Birthday to my twin-soulmate-wife-mother-spirit-guide of over a decade @beaniefeldstein. Thank you for filling my life with endless love and vegan snacks. I love you forever," he wrote.

Linklater-regular and former Glee star, Blake Jenner, is also excited to be in the cast.

While Jenner doesn't have the history that the two besties do, they clearly will have plenty of time to become tight-knit friends. Jenner replied to Platt's tweet excited about starting the project. "DITTO, couldn’t have said it better myself. So incredibly grateful and humbled to be a part of this very special film/journey and this incredibly loving and generous group of people," he wrote. 

This will be the second Linklater film to take place over the course of many years. 

The Oscar-winning Boyhood watched a family grow up and focused on the important and seemingly meaningless moments of a young boy's life over 12 years. 

Merrily We Roll Along begins at the height of a Hollywood producer's fame and goes backwards in time touching on those important moments. 

In a statement, Linklater said, "I first saw and fell in love with Merrily in the ‘80s, and I can’t think of a better place to spend the next 20 years than in the world of a Sondheim musical. I don’t enter this multiyear experience lightly, but it seems the best, perhaps the only way, to do this story justice on film."