How is it apart from the 1939 classic The Wizard of Oz and the 1978 classic The Wiz from the cast members have all passed away from both movies but Diana Ross is the last one who is alive from it?

the stars from the movie the main cast are dead - Michael Jackson who was the youngest from the cast, nipsey Russell, Ted ross, Lena Horne, and Richard Pryor

and the 1939 wizard of Oz movie cast definitely all of them dead of course but why is that? please tell me your opinions
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