Rue McClanahan, 51 years old (season 1) --- Kim Cattrell, 54 years old (SATC 2 movie)
It's kind of fascinating how Rue's character already had grown children, and was living with her three friends in a little house in Florida, I'm guessing retired? (I don't recall any of the Girls ever working.) While Samantha is a major career woman, living alone, but has traded in cards on the lanai for Cosmopolitains with her three friends.
Is Hollywood starting to take a new view on aging?