Miriam Margolyes says adult 'Harry Potter' fans worry her: 'They should be over that by now'

• Miriam Margolyes thinks adult "Harry Potter" fans need to grow up.
• Margolyes, who played Professor Sprout, is puzzled by adults still obsessed with the franchise.
• "It was 25 years ago, and it's for children," she said.

Miriam Margolyes thinks that if you're in your 30s and still identifying yourself as a Gryffindor, it's time to grow up.

"I worry about Harry Potter fans because they should be over that by now," the British-born star, who played Professor Sprout in the "Harry Potter" franchise, said during an interview with New Zealand's 1News.

She continued: "It was 25 years ago, and it's for children. I think it's for children."

Margolyes explained that she is perplexed by people who grew up with the books and film series and who continue to be obsessed with them well into adulthood.

She pointed to some of the requests she has received from fans on Cameo, a website where celebrities record video messages to fans for a fee.

"They get stuck in it," she said. "I do Cameos, and people say, 'We're having a Harry Potter-themed wedding, and I think, 'Gosh, what's their first night of fun going to be?' I can't even think about it. No."

While Margolyes conceded that the wizarding franchise "is wonderful" and said that she is "very grateful" to have been a part of it, she doubled down on her original point.

"It's over," she said. "That's what I think."

Margolyes appeared as the Hogwarts herbology teacher in 2002's "Harry Potter and the Chamber of Secrets." In a brief but memorable scene, she gives Harry (Daniel Radcliffe) and his classmates a lesson on how to correctly pot a screaming plant creature called a Mandrake.

Margolyes only shows up again in the 2011 final movie in the series, "Harry Potter and the Deathly Hallows — Part 2."

The 82-year-old previously admitted in a Cameo message to a fan that she's never read the books by J.K. Rowling and isn't a fan of the films.

"I just pocket the money when it comes in, and I'm very grateful for it," she said at the time.

Despite what Margolyes might think, "Harry Potter" seems far from over.

Warner Bros. Television and Max are developing a seven-season series based on the books. The show is eyeing a release in 2026 and will remain "faithful" to the book series, according to Casey Bloys, Chairman and CEO of HBO & Max content.