In 2018, 46 is the most common age for an American (U.S.) Polly* who is registered female with the Social Security Administration. It is the 1, 345th most common female first name for living U.S. citizens.*as a first name, not a nickname.
― Anonymous User 10/15/2018
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Polly is also a diminuative of Pauline or Paulette.
In America, Polly is a sterotypical name for a pet parrot (sort of the avian equivalent of Rover or Fido). The phrase "Polly want a cracker" is the stereotypical "talking bird" line in movies.