With preemptive apologies to any fellow Gen Xers reading this, Friday marked the 50th anniversary of the U.S. premiere of “The Rocky Horror Picture Show” movie in Los Angeles. (I know, that one stings.) Subscribe for unlimited access to The Post You can cancel anytime. Subscribe

Your fishnets may not fit quite the same, but “Rocky Horror” — director Jim Sharman’s ribald adaptation of Richard O’Brien’s 1973 stage musical — is the same as it ever was: Boisterous participatory screenings led by “shadow casts” continue to pop off in the midnight slots of theaters around the world, sustaining “Rocky Horror” as the longest-running release in film history.

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