Pardon me She was only 54 when the movie was actually filmed.

Just watched the movie again, for the umpteenth time since childhood, and I wanted to chime in on this thread.
Yes, Billie Burke was very beautiful. While filming the Wizard of Oz, she has a bit more weight on her than her much younger years, and some wrinkles around her eyes; but they don't make her look any worse than "definitely over 30".
In fact, in the past I always thought she had too many wrinkles for her age, since I was guessing that she was much younger than her actual 55 years at the time!
Great genes, a good diet, and taking care of your skin (and general health!) make a huge difference over a lifetime. Also tanning wasn't usual while Miss Billie Burke was growing up, being made popular by Coco Chanel some decades later. So that's a huge difference compared to today's usual sunbathing population among 'movie stars'.
Anyway, she was quite lovely in this role, and her adorable soft, kind, but squeaky, voice is perfect for the character.

Y'all must remember that Glinda was not meant to be a young lady. She was illustrated as being matronly in the 'Oz' books: Billie was perfect.
Even larks and katydids are supposed, by some, to dream

I was thinking the same thing when I found out she was in her early 50s in that film! She must have good genes or something.

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We've come a long way since the 1040s.

She still looked young in 1945 when she made "The Man Who Came to Dinner." She must have just had really good genes (or an amazing make-up and cameraman). I don't know if she ever had plastic surgery or when it was invented, but I know that Marilyn Monroe had it on her nose at sometime in the late 1040's. But my guess is that Billie was just blessed with a youthful appearance. She was still really cute in the 1960's.