pmensky said: "CATSNYrevival said: "Even though it's one of the more famous lines from the original movie they could just cut itor rephrase it so Joe doesn't specifically call her out for being fifty. Then she can be whatever age we imagine. She's just "older." The actual number doesn't really matter, does it?"
Yes, I think it matters, because time is important here. Norma was supposed to be a young, successful actress during the 1920's. When Norma referencesthe last time she saw Mr. DeMille, he responds that Lindberg had just landed. That was 1927. Talkies came in 1931, and by that time, she would have been considered old by Hollywood standards. The film opened in 1950, and I don't think we have any reason to assume that it doesn't take place in 1950.
When Norma returns to the studio to discuss Salome with DeMille, he is shooting Samson and Delilah. So Sunset Boulevard takes place either in 1948 or early 1949.
Joe references Norma as being 50. If you consider that Norma was born in 1900, everything falls in place and makes sense. So, they have two options, they can either just pretend Glenn Close is 50 or they can update the time period to the early 1970's. Considering the usual production design and style of music, I think the former choice is the one that makes the most sense."
Other than the line referenced by CATSNYrevival, I can't recall any other line that references her age, so she could conceivable be a bit older. That said, Swanson's "youthful appearance" was a result of a healthy lifestyle, so with some lighting and makeup effects, Close can probably pull off 50.