newintown said: "If Norma is 70 in 1950 (when the story takes place), then she would have been in her late 40s-mid 50s during the silent movie days. This detail only matters, however, to audience members who are paying attention to they story, which lets the majority off.
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True. Likewise, Blanche du Bois was intended to be 26 or thereabouts. But we commonly think of her (and play her) as in her 40s, because we don't think of single women in their late 20s as desperate and "over the hill". We certainly don't hide them in the shadows of paper lanterns.
But regardless of how they word Joe's line about aging, Norma intends to play Salome, who is 16, IIRC. If Norma is 70, she isn't tragic, just silly. I saw Ellen Geer play Blanche in her 60s and, fine actress though she is, the play got laughs in all the wrong places.