Thirty years ago, the coming-of-age romantic comedy “Clueless” opened in movie theaters and went on to become an enduring American pop culture touchstone.

“I’m thrilled that people love it and continue to love it,” the movie’s star, Alicia Silverstone, said in a recent conversation in New York. “Young people. Old people. It’s really gone on and on, and obviously that’s lovely.”

AMC Networks is counting on Silverstone’s multigenerational appeal to help boost the New York-based media company’s streaming service Acorn TV, which specializes in British dramas and other programs from overseas.

Silverstone is the lead in the new Acorn original series “Irish Blood,” which premiered Monday. She plays hard-bitten Los Angeles divorce lawyer Fiona Sharpe, who heads to Ireland to resolve a mystery i

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