My 67 years old mom flirts with 20 years old guys is this normal?

And she posts on facebook she's wearing a night gown see through which is gross because she's already old. And Its embarassing because she has grandkids who are 20 years old that see her posts. (My nephews and my nieces) She told her friends on facebook she's still young and when she takes a pic she doesn't show her face. And then she said she has thousand of likes which I could never hit. (Tbh I stopped using years ago and I dont care if someone is more famous than me) even her.
My 67 years old mom flirts with 20 years old guys is this normal?
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